Josh,
Well first of all congratulations on making a great and wise decision. I could only wish to have been as wise when I was your age.
There is a bunch of information to soak in here on the site. I recommend that you basically adopt the mentor type relationship with a few people from here and learn how to do it, and have a couple or few people to lean on because you will need those crutches along the way.
I am sending you a long PM which should help you as well as my own contact information should you choose to use it.
Until then, drink plenty of water, get a replacement (seeds, gum, lifesavers, jolly ranchers, fake dip, etc.) and quit like a hero each day. Never ever worry about tomorrow or the next day focus on today and today only.
Finally remove any evidence that you have of being a dipper, remove any stashes, empty cans, spitters, etc. Do not tempt yourself in any way shape or form.
Quit like a beast!
Pinched