I need help and Information about crystal meth?

I'm writing a book a drama and it has stuff about drugs in it. I need to know about crystal meth and a bit about weed.

What are the different way crystal meth can be formed (Like smoking, candy I heard what else is there)???

Is there anything else about it i should know?

Please do not think this is some kind of joke im being serious.

: http://alcoholdrugstreatment.info/i-need-help-and-information-about-crystal-meth