One thing i did to keep it simple was just put a bunch of my stuff inside and see how it felt; chairs, rugs, bed, table, lamps, etc. It helped me get a feel for what i wanted and needed.
I went with the 200w Renogy solar kit on amazon, and two Trojan 6v t105 batteries, and it has been plety of power for lights, tv (tv needs to be low power led so as to not drain batteries) charges all my electronics; phone, laptop, tablet, led low power lighting, and Nightowl 4 camera survielance system. Can't beat it. Oh and during the day is sit in front of a fan to cool off.