Hello everyone

I'm going to pick up my new tank on sunday
I've been to the pet store and on line, but now i'm just confused!!!
So, i thought i'd come here here where i know i can get a REAL equipment list and not a bunch of stuff i DON'T realy need. Ok so heres the situation...
We've had our carpenter build us a tank wall to fit the tank i'm getting, but i need to know exactly what i need as far as equipment goes before he finishes the dry wall. The tank is 120gal and i plan on getting african chiclids. So what kind and size of eqipment do i need????? If anyone can make these as simple as possible for me i would realy appriciate it!

Thanks for your time!
Angie