so this might be a little embarrassing, but how do I create a torrent and upload to a tracker?

I've been seeding the torrents that I download since the old days of Limewire, but I've always download and re-shared by seeding.
But a few months ago I couldn't find a set of audiobooks I'd been looking for with the original narrators from the 90s.
I finally found a set on CD on eBay and coverted those to mp3 and loaded them on my phone, but it occurred to me that others might also be looking for a complete version of the series too and wanted to share that media.
Apologies if it's an obvious answer that I somehow missed.