Since your interest in chemistry seems to be pointed, I figured it makes sense to start with basics and move up from there. This is my opinion of drug chemistry procedures/syntheses from easiest to hardest. This is a basic overview but if you can develop a grasp of all of this your certainly on your way to being a proficient chemist. Best of luck on your journey.
A/B chemistry (DMT extraction),(behavior of amines)
1,4 BDO/ GBL to GHB,(honestly don't remember due to lack of interest, its easy tho acid hydrolysis or smt)
Psuedo -> Meth/methcatinone (how to isolate starting material/ Oxidations/ reductions)
Basic tryptamine chemistry,(decarboxylation/reductive amination)
Basic phenethylamine chemistry,(multi step synthesis/ Henry reaction/ halogenations /wacker Ox. / reductive amin.)
Ketamine/arylcyclohexylamine
(Multi step/ grignard/ reductive amin./ rearrangements)