this is what i got... where to start

and i dont know what to do with all of it????
im trying to start a couple of plants in my closet... the space is 5x2x4 1/2

and i believe the light is 1000 hps(highpressure sodium??)

grow with it . it looks like u have a good start. maybe some hydroton for those bucket's.

make sure you clean them buckets out with hot water and bleach only. Let it dry for a day. Looks like your gonna need some net pots, some hydroton some rockwool some hydroponic nutes. A small fan for plant exercise and a dry hose vent duct that will fit on your light and that squrill style type exhaust fan you have there.
Best of lock and Much Respects