So this is my attempt at a solo pally that can still contribute in a party, looking for some help as I am not really sure what I am doing.

The dragonmark feats seem like fun but maybe THF feats would be better when I want some extra DPS?

Also, I am not at all sure on the spells, if someone can help point me in the right direction?

Any help would be very appreciated.

Code:
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Booteinham 
Level 20 Lawful Good Human Male
(18 Paladin \ 2 Monk) 
Hit Points: 348
Spell Points: 310 
BAB: 19\19\24\29\29
Fortitude: 21
Reflex: 14
Will: 14

                  Starting          Feat/Enhancement
                 Base Stats          Modified Stats
Abilities        (Level 1)             (Level 20)
Strength             17                    22
Dexterity             9                    10
Constitution         13                    14
Intelligence         12                    13
Wisdom                9                    10
Charisma             12                    12

Tomes Used
+1 Tome of Dexterity used at level 3
+1 Tome of Intelligence used at level 3

                  Starting          Feat/Enhancement
                 Base Skills         Modified Skills
Skills           (Level 1)            (Level 20)
Balance               1                    22
Bluff                 1                     1
Concentration         1                     5
Diplomacy             1                     1
Disable Device        n/a                   n/a
Haggle                3                    12
Heal                 -1                     0
Hide                 -1                     0
Intimidate            1                     1
Jump                  5                    16
Listen               -1                     0
Move Silently        -1                     0
Open Lock            n/a                    n/a
Perform               n/a                   n/a
Repair                1                     1
Search                1                     1
Spot                 -1                     0
Swim                  3                     6
Tumble               n/a                    n/a
Use Magic Device      3                    12

Level 1 (Paladin)
Skill: Balance (+2)
Skill: Haggle (+2)
Skill: Jump (+2)
Skill: Use Magic Device (+2)
Feat: (Selected) Exotic Weapon Proficiency: Khopesh
Feat: (Human Bonus) Toughness
Feat: (Automatic) Attack
Feat: (Automatic) Aura of Good
Feat: (Automatic) Defensive Fighting
Feat: (Automatic) Heavy Armor Proficiency
Feat: (Automatic) Heroic Durability
Feat: (Automatic) Light Armor Proficiency
Feat: (Automatic) Martial Weapon Proficiency (ALL)
Feat: (Automatic) Medium Armor Proficiency
Feat: (Automatic) Shield Proficiency (General)
Feat: (Automatic) Simple Weapon Proficiency
Feat: (Automatic) Smite Evil
Feat: (Automatic) Sneak
Feat: (Automatic) Sunder
Feat: (Automatic) Trip


Level 2 (Monk)
Skill: Balance (+2)
Skill: Haggle (+0.5)
Skill: Jump (+2)
Skill: Use Magic Device (+0.5)
Feat: (Monk Bonus) Power Attack
Feat: (Automatic) Exotic Weapon Proficiency: Kama
Feat: (Automatic) Exotic Weapon Proficiency: Shuriken
Feat: (Automatic) Finishing Moves
Feat: (Automatic) Flurry of Blows
Feat: (Automatic) Ki Strike: Damage
Feat: (Automatic) Unarmed Strike


Level 3 (Paladin)
Skill: Balance (+0.5)
Skill: Haggle (+0.5)
Skill: Jump (+0.5)
Skill: Use Magic Device (+0.5)
Feat: (Selected) Least Dragonmark of Passage
Feat: (Automatic) Divine Grace
Feat: (Automatic) Lay on Hands


Level 4 (Monk)
Ability Raise: STR
Skill: Balance (+2)
Skill: Haggle (+0.5)
Skill: Jump (+2)
Skill: Use Magic Device (+0.5)
Feat: (Monk Bonus) Combat Expertise
Feat: (Automatic) Evasion
Feat: (Automatic) Meditation


Level 5 (Paladin)
Skill: Balance (+0.5)
Skill: Haggle (+0.5)
Skill: Jump (+0.5)
Skill: Use Magic Device (+0.5)
Feat: (Automatic) Aura of Courage
Feat: (Automatic) Divine Health
Feat: (Automatic) Fear Immunity


Level 6 (Paladin)
Skill: Balance (+0.5)
Skill: Haggle (+0.5)
Skill: Jump (+0.5)
Skill: Use Magic Device (+0.5)
Feat: (Selected) Lesser Dragonmark of Passage
Feat: (Automatic) Turn Undead


Level 7 (Paladin)
Skill: Balance (+0.5)
Skill: Haggle (+0.5)
Skill: Jump (+0.5)
Skill: Use Magic Device (+0.5)


Level 8 (Paladin)
Ability Raise: STR
Skill: Balance (+0.5)
Skill: Haggle (+0.5)
Skill: Jump (+0.5)
Skill: Use Magic Device (+0.5)
Feat: (Automatic) Remove Disease


Level 9 (Paladin)
Skill: Balance (+0.5)
Skill: Haggle (+0.5)
Skill: Jump (+0.5)
Skill: Use Magic Device (+0.5)
Feat: (Selected) Improved Critical: Slashing Weapons


Level 10 (Paladin)
Skill: Balance (+0.5)
Skill: Haggle (+0.5)
Skill: Jump (+0.5)
Skill: Use Magic Device (+0.5)


Level 11 (Paladin)
Skill: Balance (+0.5)
Skill: Haggle (+0.5)
Skill: Jump (+0.5)
Skill: Use Magic Device (+0.5)


Level 12 (Paladin)
Ability Raise: STR
Skill: Balance (+1)
Skill: Haggle (+0.5)
Skill: Use Magic Device (+0.5)
Feat: (Selected) Greater Dragonmark of Passage


Level 13 (Paladin)
Skill: Balance (+1)
Skill: Haggle (+0.5)
Skill: Use Magic Device (+0.5)


Level 14 (Paladin)
Skill: Balance (+1)
Skill: Haggle (+0.5)
Skill: Use Magic Device (+0.5)


Level 15 (Paladin)
Skill: Balance (+1)
Skill: Haggle (+0.5)
Skill: Use Magic Device (+0.5)
Feat: (Selected) Mental Toughness


Level 16 (Paladin)
Ability Raise: STR
Skill: Balance (+1)
Skill: Haggle (+0.5)
Skill: Use Magic Device (+0.5)


Level 17 (Paladin)
Skill: Balance (+1)
Skill: Haggle (+0.5)
Skill: Use Magic Device (+0.5)


Level 18 (Paladin)
Skill: Balance (+1)
Skill: Haggle (+0.5)
Skill: Use Magic Device (+0.5)
Feat: (Selected) Extend Spell


Level 19 (Paladin)
Skill: Balance (+1)
Skill: Haggle (+0.5)
Skill: Use Magic Device (+0.5)


Level 20 (Paladin)
Ability Raise: STR
Skill: Balance (+2)
Enhancement: Paladin Armor Class Boost I
Enhancement: Unyielding Sovereignty
Enhancement: Follower of the Sovereign Host
Enhancement: Human Adaptability Constitution I
Enhancement: Human Versatility I
Enhancement: Paladin Courage of Good I
Enhancement: Paladin Bulwark of Good I
Enhancement: Paladin Bulwark of Good II
Enhancement: Paladin Bulwark of Good III
Enhancement: Paladin Bulwark of Good IV
Enhancement: Paladin Focus of Good I
Enhancement: Paladin Resistance of Good I
Enhancement: Paladin Resistance of Good II
Enhancement: Paladin Resistance of Good III
Enhancement: Paladin Exalted Smite I
Enhancement: Paladin Exalted Smite II
Enhancement: Paladin Exalted Smite III
Enhancement: Paladin Exalted Smite IV
Enhancement: Paladin Extra Lay on Hands I
Enhancement: Paladin Extra Lay on Hands II
Enhancement: Paladin Extra Lay on Hands III
Enhancement: Paladin Extra Smite Evil I
Enhancement: Paladin Extra Smite Evil II
Enhancement: Paladin Extra Smite Evil III
Enhancement: Paladin Extra Smite Evil IV
Enhancement: Paladin Defender of Siberys I
Enhancement: Paladin Defender of Siberys II
Enhancement: Paladin Defender of Siberys III
Enhancement: Racial Toughness I
Enhancement: Racial Toughness II
Enhancement: Racial Toughness III
Enhancement: Monk Wisdom I
Enhancement: Paladin Toughness I
Enhancement: Paladin Toughness II
Enhancement: Paladin Toughness III
Enhancement: Paladin Toughness IV