Supplies and experience. Practice makes perfect, so get good products and practice on your own car until you become really good at it. Then the best bet would be to try and get business from your friends who have cars and some money to spend who don't like washing their own cars but will be willing to pay you.
Faster than a speeding...............
2001 Bullitt being prepped for track duty
Corners > Straight line
HID end all thread