I just went back and forth from Home Depot,Hydro Store and the Pet shop. If you are looking to just experiment start off with a decent size reservoir. I went with an 18 gallon rubbermaid(like) tub. Although i've been watching the thread on people using ice chest/coolers! From my experience(three weeks!) I would just get a tub, 6 inch net pot, 2 or 4 outlet air pump and a few air stones. I've had my plants in a DWC for three weeks and they look amazing. I also picked up a clone from the local dispensary so it was ready to go as soon as my setup was complete. The water pump for a drip system is fun but not really needed IMO. I feel the submersible;e pump just heats up the water. Like others say Cool Water,No light!
Look up some videos on Google. Search Deep Water Culture and you will find a ton of helpful videos.