1 yeah mate its easy. just paint the interior flat white or cover in mylar or white plastic sheet.
2 Important !you need a hole in the top for this = you need an extract fan, a cheap bathroom fan will do well if nothing else ! a better fan and scrubber "carbonfilter" would be best !
3 you need holes in the bottom for passive air intake(or another fan if money available for forced exchange this fan must be about 20% smaller than extraction fan )
4 a light ! depends on size of space and what you can afford !
loads of people have done this and done a diy guide to it just have a mooch about on here.