I'm kinda of looking just for a way to not have that much trouble in combat (i'm ok with roleplaying any class since i'm more focused on the race/personality of the champion them their class per say). Maybe a support or a second damage dealer.
Take a
power that buffs your party, concentrate on stats that buff your whole party (Leadership), take a power that heals your party, take a power that damages opponents, play the game. If there are too many support options, restrict yourself to the White Mage class because that's what it ostensibly does. If that doesn't work, lower the difficulty. If that doesn't work, change powers. After that, ask for help, because if you're indifferent to the powers you pick and just want story, everyone else should be
at least as indifferent as you are your decisions until you've tried actual story mode.