Welcome to the game!!
Which character to play? Any and all of them. For mainly PvE, anything will do, some are better at some things then others of course, but there is no “trinity”. No specific DPS/Tank/Healer. All of the classes can do all of the things, of course some better than others. Pick one you think you’ll have fun with and go with it.
Servers: They basically are all the same. There are some who focus more on PvP and WvWvW, and others PvE and world bosses, some are roleplaying. There is no “official” difference between them. And with the megaserver roll out, the server really only effects WvWvW. Pick one that you feel comfortable with, generally in the same time zone/area as you and roll with it.
Guilds: Too many to list. Find one that fits your play style and what you want to do. You can join up to 5 currently so don’t worry about being stuck in one. Ask questions of recuiters and join some that fit well with you.
http://gw2.guildex.org/guilds/na
A list of guilds to kind of help you out. There are a bunch of them, and mostly tied to servers, but you don’t have to be on that server to join a specific guild.
Most of all, have fun!! Hope to see you in game!
P.S. I don’t know how up to date that list is…but it should help you get started at least.
