My husband gave me a new aquarium for mothers day.. I am not sure where to start I am new to this hobby this year and currenty have a 20 gal. The tank is 48L x 24W x 24H 120gal has two predrilled returns I need some help with the size of equipment I will need to run this tank. I have listed the items I think I need and a couple of think I was looking at in the local aqutic store. Thank you for any advise you can provide.

Heater - ?
wavemaker - ?
Powerheads - ? no clue
sump -? eshopps RS-200


skimmer -?
pump - ?
amount of live sand needed?