Learning to Publish on DriveThruRPG
When I started publishing on DriveThruRPG, this was how the Publisher Tools section worked: you emailed a zip file of your games to them and they did the work to put them online. I think there were about 40 publishers on DriveThruRPG when it launched, and by my rough math between 5 and 6% of total titles were ones that I personally uploaded!