Good caster DPS? Ease of play for first timer?
Hands down - Necromancer.
Put a larger majority (if not all you can) into cha, this will decrease the chance that your offensive spells will be resisted.
Notes: you will be put in a guild as soon as you start up, this guild is called Dalaya's Beginners. Lot's of people have characters in the guild.
Don't hesitate to ask a question by typing /gu <question goes here>
Don't get too bummed if you die a bunch at first, it's a fairly hard game. Just keep at it and you'll be as addicted as all of us, lol.