New setup filtration question

[Lonesomme]

I have been reading about sumps and filtration methods and I think I am making this harder than it needs to be. I am building a 65gal reef with a 20 gallon sump. I am confused about filtration. I am going to put the skimmer, thermometer, heater and return pump in the sump. I am going to add apprx. 80lbs of live rock and a little more than 1lb per gallon live sand. I am confused about mechanical and chemical filtration, I have read to remove the filter sock from the overflow and some people dont use the sponge between the skimmer and the return pump. So what do you do to get floaties out of the aquarium? Do you use carbon in the sump? Any and all advice would be greatly appreciated.

Thanks
TF