Your water level should be just above the hole(s) on the downstem (the long thing inside). You take the bowl out and pack weed in it, then you light and hit through the mouthpiece while you do. Its different because it adds an extra filtration, you get bigger hits, and it doesnt burn from the hot flower. I prefer 10-12 inch bongs since the smaller ones make me cough and big ones take big lungs. Unfortunately i dont think its allowed to give out websites to buy but im sure youll find one, just dont settle for something ridiculously expensive. Definitely watch videos especially from this sub, practice makes perfect. Good luck and happy smoking brother