It's best to err on the side of lower power levels, especially when you first start. It's easier to power up a character than to nerf them, if you need to tweak levels after you've gotten the hang of things. A general rule of thumb - if you're slinging around powers that would insta-kill an unpowered npc human with no chance of surviving, then you probably should tone it down.

Also be sure and read the faqs. *points to link in sig*

Welcome!