If you see Elphyba online, feel free to /tell me and we can run together.
She's a 17 AA / 2 trapmonkey on Orien; luckily while I was still pretty noobish got brought into a guild with leaders who believe in helping young toons along.
Here's my experience:
1) For mobs, try not to shoot before melee guys engage, that way you are less likely to draw aggro
2) Focus your manyshot on the casters during the run-up to the boss, and you make life much easier on everyone.
3) You can throw some decent buffs, so you may be able to help the casters focus their SP on offense
4) Keep a variety of two-weapon combos in your hot-bars. There's five combos I personally keep handy, and I'm always thinking about how to improve: vorpal/paralyzer, two ghost touch, two bludgeon (for skeletons, etc), metalline/smiting (for constructs), two (greater) undead bane. I've got a TWF combo for just about anything that gets up close and personal.
5) Similarly, I keep a variety of bows handy and switch out as appropriate. One of my wizards buddies and I have a great thing going: I hit them with improved cursespewing and then they don't save against his finger of death. Just got a paralyzing bow last night, so I'm excited to try that out.
6) Bringing a pet is wonderful 99% of the time - it gives the enemy someone else to shoot at. Just be very care in Sleeping Dust
Good hunting!