jrmeers4 :
Does the size matter, and how many fans do you recommend
Depends on the case, your budget and how many fan headers you have on your motherboard or if your case has a fan hub.
For example I'm getting a NZXT H500 case which can house 4-120mm fans. I'm getting 4-120mm LED fans but my motherboard has only 2 case fan headers so I'll need 2 PWM fan splitters to use all 4 fans.