Play on MIthras if you plan on trying to run endgame content.
Mithras uses /Trade. You can join a starter guild like Whitesharks, Orion, Crush.
Here's a list for you of Endgame viable classes:
DPS:
W/Wd
W/S
S/Wd
S/R
R/M
Healer:
Druid/Warrior/Warden
Tank:
Knight/Warrior/Priest
Debuffer/Buffer Classes:
M/Wl
Wl/M
Ch/P
K/P
Wd/S
Don't pick anything outside of these classes if you want to actually be useful and pull your weight properly in all endgame instances. There are others that are semi-viable but honestly unless you want to be carried or constantly half the usefulness of everyone else this is your list. Do not under any circumstances choose a magical class as dps.
W = Warrior
Wd = Warden
S = Scout
R = Rogue
M = Mage
Wl = Warlock
Ch = Champion
P = Priest