I tend mine 2x a day.. am before the lights go off for the day in order to check for anything that may have happened during the night.. and again in the PM when the lights 1st come ON ... check for whether or not they need water etc..
If doing soil, I would suggest going with a "just add water" and "Top dress in flower" type soil... (PM me for more info)
Get a T5 light fixture that fits the closet...
get a small oscillating fan you can hang from the wall or ceiling for air movement...
find a place in the closet you can cut a hole for a 4" duct and fan for fresh air intake from a room nearby...
Find another spot up high where you can cut another hole for a passive air exhaust...
put weatherstripping all around the door-frame so it shuts TIGHT and has NO light leaking IN when the lights in the room are on- you WILL have to get inside to check!
Find out if you have everything you will need available to you easily....
READ READ READ READ!!! (you can start with the links below-- and borrow or buy a couple books-- Greg Green and Jorge Cervantes are both good- I prefer Cervantes especially for beginners!)
OH! And I forgot to tell you-- it was NOT a "Stupid Question"...
It WOULD have been if you thought about it, didn't bother to ask, tried it, then asked for help when it didn't work!
Good Luck!
Growers Terms and methods 101
http://www.marijuanagrowing.eu/terms-and-methodsall-growers-need-to-know-t12763.html
Grow Guide:
http://www.marijuanagrowing.eu/step-by-step-growing-faq-s-please-read-before-posting-t20217.html
MANY NUTES and FEEDING CHART FOR THEM:
http://www.marijuanagrowing.eu/nutes-what-to-use-and-how-to-use-em-t14033.html
Male or Female?
http://www.marijuanagrowing.eu/topic42357.html