Shop around a bit.
Use the 'Detailed Image' Detailing Guide for answers on all of your questions. IMO, totally honest reviews and tutorials on different products, techniques, and practicies. It was an invaluable resource for me.
http://www.detailedimage.com/Auto-Detailing-Guide/
Lastly....try to do some more research. The search feature here is great.....many of the questions you could possibly come up with have already been answered.
Hope this helps.