Your should aim for your temps to be 75-80F ideally and but never let them go over 90F

You NEED to get hot air out of the grow area and NEED to get fresh air into it. You should exhaust the hot air from the top of your closet and intake fresh air from the bottom. The usual setup for a small grow such as yours would be to have a RVK or similar fan extracting the hot air from the top of the closet and just have a couple of holes in the bottom of the closet where fresh air will be sucked. There are ways of doing this so it can still be stealthy, put your vents in positions that are obscured, if it's a tall closet you can vent through the top into the loft for example, or your bottom intake vents could be obscured by a chair or speaker.

Check out some similar logs and read the faqs too.