There's a recent thread about chemicals and stuff:
https://sanctioned-suicide.net/threads/methods-by-easy-to-obtain-chemicals.8359/#post-144210
If you want a SN (sodium nitrite) method, read this thread:
https://sanctioned-suicide.net/threads/sn-megathread.1156/
For N (Nembutal or pentobarbital) method, read this thread:
https://sanctioned-suicide.net/threads/megathread-getting-n-from-a.2544/
Also there's plenty of information on sanction-suicide.com about chemicals and stuff. You can download "Peaceful pill eHandbook"
https://sanctioned-suicide.net/threads/list-of-resources.3/
EDIT: Personally I think N is the best method, it's the most peaceful way to die.