i tried serious magic ultra... it didnt work for me at all (maybe my green screen wasnt perfect?). so i just use after effects for keying. if you got some flourescents, those really light the screen evenly... then throw another one on the talent thats really soft so the shadows dont go crazy. its going to seem like really flat lighting since you are probably working in a small space i assume and you cant place your subject like 10ft or more from the screen. really, just watch your shadows and play around with lighting it.
my green screen is ghetto and small (8ft tall 4 ot 5ft wide). the hardest thing i have with that is the green bounces off and people end up with a green back light... to eliminate this, pull the people further away from the screen (i have no room so i cant do it). If you can pull them away from the screen you can light everything evenly and it will rock.
Good luck, if you got any problems with keying let me know, i might know a trick or two.