Hell, even tricking can be dangerous, without a spot. If you're trying to self teach a wall kong, you're gonna have a bad day.
If you have nothing around you, but boxing, it is the obvious choice, but there may be other options, like getting in on a couple practices with the local highschool wrestling team, with approval, of course. If you go in and just start grabbing young boys, you move from RLSH to RLSV.
Outside of that, I don't ever recommend those mail order instructional videos. Sure, monkey see-monkey do, but more often than not, monkey see-monkey do wrong. You might think you're throwing the punch, just like the guy in the video, but...probably not.
If you have no access to any kind of fight training, stick with simple calisthenics and plyometrics, then put up some feelers for locals who have experience in some kind of martial art. Also, you can safely find a tree and work some Sumo teppo, to build up some upper body strength and toughen you up, a bit.