pc grow case help

hey everyone. first things first, im a total newbie to both growing and this website. i have decided to grow a couple plants using a pc grow case that i will build myself. but i have a couple questions for you guys if you could help a friend out. once again im a total noob. i have my basic layout for the case and how it will be built but the thing that i dont get is how would you make the pc odor and light proof? i mean the light excapes through the fans and im pretty sure there smell. im all about stealth by the way. so how would i keep light from leaving and entering the pc and how would i get rid of my plants scent?
please help a newbie out. is there maybe a pc grow case guide that will show me step by step on how to build and grow in my pc???

put an intake and get yourself a bottle of ozium the silver can (original) that should take care of the smell. also what lighting system are you using?