Hey guys need some info....

75 gallon
2 pinches of flake daily
1/4 frozen cube daily

What size of screen do I need and one or two sided screen.
Do I need lights on both sides or just one?
What wattage light do I need....and is the wattage divided, if I have two sided lighting?
Example.... if I need a 100 watt...do I do 50 watts on 1 side, and 50 watts on the other?
If I do a bigger screen than usual......thinking about doing a 10x10.
Equally square or wider then longer?

Thanks