So I have been working with a guild mate to plan out my Monk life. (Life #6 - Cleric, Bard, Sorcerer, Rogue, and Barbarian previous.) I think I want to do a DC focused unarmed monk. My thoughts were to build it 12/6/2 monk/fighter/warlock. Warlock for the quality of life that having access to shield and UMD brings (plus some light synergy), fighter for access to the Kensai tree, and monk for obvious reasons. I was also thinking about going Dwarf for their racial Tactics options. My stat block would look something like this:
Str 8
Dex 16
Con 16
Int 14
Wis 18
Cha 6

My problem is that I suck at doing the best breakdown of when to take what class levels. I am pretty sure that I want my first 3 levels to be monk, so that I can get access to PoHB: Fists of Light ASAP. After that, I was thinking of taking warlock and then fighter, but I am not sure how to optimize my build. Feat wise, I was planning to take the following in my first few levels:
Two Weapon Fighting
Stunning Fist
Precision
PoHB:FoL

After that, i am at a loss. I can wing it, but I would appreciate some help maximizing/streamlining the build. Basically, I don't want to ever have to worry about my DCs of my special attacks not being good enough. I would like to work ITWF, WF, and IC in if possible. Maybe Shuriken Expertise. Any help would be appreciated.

Thanks in advance.