Seems like your questions are already answered but yeah. :P

1. I'm not sure...my mom paid for it for me for a birthday present :3

2. Yes, you need to buy the shampoo, but I used whatever conditioner I had laying around and it was fine.

3. Yeah, that's what my stylist did. free o charge. DONT WASH IT! it'll be uber greasy but you can mess it up bad.

4. Unfortunately, yes. You have to leave it hang. D:

I personally hated it. It caused my ends to split up real bad. I wouldn't do it again. D:< But my hair was really soft, though.

Good luck!
15, CG since: June 10th, 2009!
3b with a little 3c-ish. A little past bsl.

Products:
Co Wash: Suave Naturals Coconut, Juicy Green Apple and Refreshing Tangerine[changes with my mood, hehe!]
Conditioner: Garnier Fructis Sleek and Shine
Leave In: Garnier Fructis Sleek and Shine
Gel: L'Oreal Light Headed Melting Gel Non-Hardening Gel / L'oreal Clear Minded Clear Gel