You are on the road to making a very wise choice. The first thing you must do is disasociate yourself from all people who use or sell stimulates, This can be very hard. In my case if I'm around meth I want to use, so I stay away, in time this may change.
The second thing that works for me is when i get cravings I think about the crash not the high, you know that felling after being up for days and your burning the stem of the pipe trying to get one more hit, then searching the house for that one shard you know you lost.
The third thing is a fact, very few people can control meth use/abuse. meth postives, you feel good for a while, your more social for a while, maybe you get more work done.
The ugly, you lose all your real friends, if you have a job you could loose it,wives ,girlfriends , boyfriends if they do not use they will more than likely leave you ,your mental and physical health will go to hell, if you have money in the bank kiss it goodbye.
The scary part, after all these things you are still a long way from rock bottom.
I wish you luck.