Need help on setting up Closet grow!

Hey guys im kinda new so any help is appreciated i have a Closet thats 9 feet tall but with the shelf on 2 sides of the wall im left with 6 feet 6 inchs, 4'9 wide and 4 feet deep, What is the best setup for lights and cooling to end up with the most bud??? i already have a 8 bulb t5 pannel vegging a couple plants in my garage but i wana grow and flower everything in my closet Any Suggestions!???? Thanks

*Also there's an attic opening door/shelf in the ceiling above