I make those for less than half the price. I started with just drip but throw in a air stone and that's it.. If you don't want to make one they are great for a small closet and a 400 to 600 light. 2 of them and a 1000 watt light can get you over a pound at harvest.

You need ventilation. A good PH/PPM meter and I would get 1 inch rockwool cubes for clones or seeds and more hydrotron rocks. Most of all some good nutrients like General Hydroponics 3 part and PH up and down.