Welcome back! I came back about four months ago, and while I can't directly give you information on your server, i can try to help.

Most players at this point are high level, and in Mor Dhona, which you will hit around level 45 or so, though you will run into players via the Duty Finder, which leads to the next question.

Once you hit level 10 you will have Guildhests opened through a quest and will be able to be teamed with other new players. The firt dungeon that "requires" new players will be Sastasha at level 15, which will also be accessed using the Duty Finder.

I don't know if there is a server that is geared more towards new players, but the Free Company I am in on Midgarsormr welcomes new players and there is almost always someone willing to help out if you need it, so if you have not put in so much time that you don't want to transfer send me a PM and I am sure we can track you down in game.