There's plenty of resources on the forum to look at. The most popular for a while have been SN, and hanging (both partial and full). As for violent methods, I know a few have had success with firearms (though laws may make that difficult depending on where you're based). Most of the resources on the forums seem to lean towards either painless, quick, or effective, so it may be worth doing your own research if those aren't priorities for you.
And, as goes without saying, make sure you do plenty of research to avoid complications.
Wish you all the best regardless of which path you chose