Here are some resources with good fairly reliable info:

• https://www.erowid.org/ The largest collection of articles, experience reports, safety advice and academic discussion.
• https://psychonautwiki.org/wiki/Main_Page Good quick reference of most safety and dose questions you might have.
• https://pubchem.ncbi.nlm.nih.gov/ good free database of all the chemicals we know about.
• https://getyourdrugstested.com/ FTIR Spectroscopy testing by mail in Canada. Send them a donation if you use them so they can keep helping street people not die from fentanyl for free.
• https://dancesafe.org/drug-checking/ Get your own reagent testing kits.
• https://wiki.tripsit.me/wiki/Drug_combinations quick safety guide to combos.
• https://combo.tripsit.me/ check specific combinations with more info
• https://wiki.tripsit.me/wiki/Main_Page Decent collection of info on safer use and dealing with bad trips, overstimming etc.

TIHKAL - Tryptamines I have known and Loved by the Shulgins. Alex was the first to synthesize mdma and document it's effects on humans and he stayed the first for many other new now illegal sunstances for many decades after that. Him and his wife were cooler than you and their reports are certainly interesting and imformative reading. Has synthesis instructions and experience reports

https://erowid.org/library/books_online/