This one is really easy, just do nothing, stop combing your hair. You can and still should wash your hair, but it is optional.
Go to the salon, they will take care of everything.
You can go to a salon, or do this yourself. I recommend doing it yourself, because you’ll save a lot of money. Rub the soft bristle brush in a clockwise motion. Rub about an inch at a time, you will start to see little sections of balls forming. After you have rubbed your entire head, use a small amount of wax on each little ball. You can use a hair dryer to melt the wax into your new little dreads.
You can start right now! Just section off your hair, you can use the rubber bands to start your sections, and start twisting each section. After you have twisted a section, wax, and you can put a rubber band on the tip, but it is optional, and you probably don’t need to. If you can wait until your dreads lock up before you wash them it would be great but if you need to wash, be very careful, because the dreads are very delicate until they lock up. You might want wax and put rubber bands on the tips before you wash to help hold the hair together.