I found a link to a site where they take you through it, but it's one of those silly forums where they call themselves SWIM and all that childish nonsense.
dxm is available at chemists, shrooms are easy to grow from spores, codeine can be extracted from paracetomol/codeine combos (although i would advise getting pure codeine from your doc if possible), codeine can be converted to morphine (this can get technical if you have no chem experience), coke converted to freebase is easy, getting morning glory seeds and making prep..... theres more if you want?