Don't be afraid to use protect, especially against Monks and AST, but this may not be viable in the middle of a feast match. Capitalize on PvP skills and NEVER use the PvE Raise/Ressurect/Ascend. Also the PvP raise (can't remember the name, sorry) is instant cast so you won't have to waste your Swift Cast. If you're surrounded by melee, use Aetheric Burst and Aura Burst (I think?) since this is an AOE Fluid Aura; just be weary of a tank's Pushback ability. If not, just Blizzard II and run. One last thing, don't waste time casting Shadow Flare unless you're breaking Ice or forcing people out of bubbles, leave that to SMN.

Hope this helps but you can get better advice from other people. Oh, right, don't worry about any venom you may get for being new; they were new at some point.