Im planning on quitting all mind altering substances tomorrow, this includes meth, cigs, alcohol, sugar/caffeine, any helpful tips on how to succeed?

See details: You should consider an in-patient rehab rather than trying to quit all of these addictions cold turkey.

Support group: Quitting all of these addictions at once may not a formidable task but a highly motivated person can do it. Most however requires medical, psychologic, and support group's help. Have you thought about joining AA? Good luck to you.