I thought I'd add a list of basic equipment and supplies to get going solidly and on a tight budget.

Lights:
2 Shop lights- 4- foot, T-12, 2-tube fixtures, Home DePot, $8 each, plus 4 Cool White or Kitchen and Bath tubes to put in them
1 HPS 400, about $150 for an inexpensive one. If you go bigger, or have a small space, spend the extra ~50-100 bucks on a quality air-coolable reflector.
1 4" duct booster fan, a power tool replacement cord, and a length of 4" flexible ducting- you will use this to cool your light. The fan needs the cord; black to black, white to white, green to ground, secure with wire nuts. Home DePot, $35 total.

Air handling:
1 24" metal high velocity fan, $25 at the dollar store or walmart, or a couple cheap oscillating fans.
You can spend some more $$$ and buy a proper 6" exhaust designed for a grow if you like. With a small light, it isn't particularly important yet.
Depending upon local weather etc, you may need an a/c unit, which you will also use as a dehumidifier, about $80 at home depot.

Containers and media:
1 seedling starting tray with inserts and dome, $9 for a proper one with a tall dome that you will later need for cloning.
About 10-15 4" square deep quart nursery pots, I get mine free from a nursery dumpster or for 25 cents each if the dumpster is empty, lol.
10 finishing pots, should be about 3 gallons for a light that size. Kitty litter pails work well. Drill holes in the bottom AND up the sides with a 1/2" paddle bit.
1- 40# sack of Agway manure with humus
1- 8 qt sack of perlite
1 bag of farfard seedling starting medium- it's not overferted.
Big rubbermaid tote for mixing and storage

Nutrients and other chemicals:
SuperThrive
Alaska Fish Emulsion
Cornucopia Bloom or PureBlend Pro Bloom
Sweet
Molasses
pH kit that includes liquid indicator, up, and down
Green Light neem concentrate
Bonide Rotenone with Pyrethrins (only use in veg, and only if you get bugs)
I also like to keep Soil Syrup and GH Micro around to fix any problems that arise.

This is literally ALL you need to get going!

Cloning supplies:
RapidRooters
Dip-n-Grow
X-acto knife w/ blades
use the prop tray you already have, but clean it well
Wilt-Pruf