I have been playing since August 2020 and still consider myself a noob. One thing I would recommend to new players is that it is much easier to get experience and gear and advance your character if you play with others. D&D really is designed to be a team game.
That being said, it can be hard to figure out how find people to play with. On the player screen at left bottom corner is an icon; click on that to see menu. Scroll up menu and you will see something called Social. Click on that. Click on Groups/LFM, which is where people advertise the dungeon they are doing and that they are looking for others to play with. You can click a box so that it only shows LFMs for your character level range. Click on join.
Now the hard part for a Noob (and this is my biggest complaint about the game) is finding the quest! You won't know where to get the quest giver (a non-player character who gives you the quest and allows you to enter the quest) or even where it is located. So frustrating! And I always feel embarrassed that it can take me a long time to find and enter the quest while the others are in there killing monsters.
But you can ask by commenting in the Party chat that you are new to game and can't find it. First you need to know what part of the game world it is located and then figure out how to get there either through the GuildShip if you have a good one, or through a teleporter or by going to Marketplace and then the proper entrance to neighboring area. Now, sometimes the players are in the quest and busy fighting so they may not be able to help you find it; in that case, do a quick wiki search with the name of the quest and you can then find who is quest giver and where they are located.
Once into the proper city or wilderness area, you need to get the quest and find the entrance. If you ask the group to share the quest with you, then that takes care of the flagging. If not, you need to find the quest giver. Go to Adventure Compendium and type in the name of the quest. Look for name of quest giver. Now look for that NPG on the map. After you get the quest, it should light up the quest entrance on your map. If it is a wilderness area though, it can still be hard to move through the wilderness to get to the quest--Gianthold, Orchard of Macabre, Meridia, Eveningstar Prison, Menacturun dessert all give me fits still.
Once you are into the quest instance, tell the group and ask where they are. Sometimes they are near the end and it doesn't make sense to try and go there. You can pike it (stay at the beginning and wait for completion) and get the exp and then join the group after exiting on the next quest; most don't care. If you try to catch up alone, be aware that sometimes there are traps that may not have disabled, don't go into rooms that are not opened as you may get overwhelmed by monsters the group skipped, and be aware of spawning monsters.
Most LFM groups go fast. If you want to take your time and read all the story text and explore every room or cave, you can always do it solo another time. But if you do that in a group you are likely to be left in the dust and will likely die alone by a mob.
So why go to all this trouble?
You can do three or four quests in the time it would take you to do one alone. So you get exp faster and level up faster.
You can do quests on more difficult levels so you will get more exp.
You will get more gear and often older vets who have all the good named gear will ask if someone wants an item and will pass it to you in the chest. So you can get good gear faster.
You can make friends and then when you see them on in the future (look for Friends under Social), you can play with them. You may even find a friend or two who prefer to play your style. To add friends, click on the character name and then click on the icon next to name and then click on Add Friend.
I still find it hard to figure out how to make my own LFM group and configure it properly but I have at times. One time I was soloing Flesh Maker's Laboratory to try and complete a quest item so I could upgrade my Quiver of Alacrity. There is a place where you need to touch five ruins in 20 seconds or you can't move forward to fight the boss. Despite my best efforts with my pet and hireling, I couldn't do it. After almost three hours of trying I created a LFM thinking, who is going to join me alone when they can see I am 187 minutes into the quest? I was embarrassed to say the least, but I didn't want to quit and I really wanted to upgrade my quiver.
Lo and behold two veterans joined and helped me. Neither of them needed to complete the quest or needed the loot. They did it to help me. I don't know them. Thanks by the way!!!! I completed the quest with help and then one of them passed me some of the pieces I needed to get my Black Abbott seal and I now have my upgrade quiver!
Don't be afraid fellow newbies.