Hi Vaquum and welcome to the forums!

how about getting into the action and using casters as called-in fire support?
something like a warrior tank for your main, and bring along 1 priest and 2 mages for fire support?
it'd get you into it, for sure... plus all those classes mixed up would definitely be a challenge to coordinate efficiently

whatever you decide, please post a pic of your group in the screenshots section so we can all check it out

have a great weekend,

-- Rob