New to Boxing and Want to Train Smart

I recently began boxing with a friend and wanted to get some advice so that I don't pick up any bad habits. There aren't any gyms near me and I don't have access to a trainer so it's pretty much just my friend and I. We usually start out with a few rounds on the heavy bag, and then spar a few rounds with one of us working on our defense while the other goes on the offensive, and then end it with a final sparring session at about 50-75% speed. Do you have any advice on what drills to perform or what to do or not do? Also how does our routine sound?

Thanks