Is it important to figure out what exactly classes and role you want to be. Hope this DCUO Guides: Classes and Role will give you an idea on what classes to pick.
- Damage Dealers, which specialize in dealing damage to enemies. Damage dealers are usually good at playing solo and are powerful in large-scale player versus player battles.
- Tanks, which specialize in taking damage from enemies. The best tank appears to be Ice / Martial Arts / Acrobatics at the moment, so this should be your choice if you want to be a tank.