You really only need the starter system, which can run up to 10 nozzles. It comes with just one single nozzle, so you may want to buy more. I run one double nozzle mist head per standard 2x2x4’ enclosure. I used to have my mist heads in the middle of the back, but so I can reach things easier, have moved them all to the front now. The screen wedges are pretty much needed so that the nozzle has support and won’t just fall thru the screen top. I also bought the tubing cutter, which has made life much easier for me. The only other things you’ll need is a reservoir (aka bucket) to hold your water and a drill bit of which size I can’t recall right now. I use a 5 gallon bucket as a reservoir.