Get your ass whooped and robbed by bandits. Genuinely the only real way to train your combat early-game. They won't enslave you so you'll prolly be ok.

Once you can actually fight them, then you basically enslave them. As a training dummy, of course. Keep knocking them out and then when they get back up, just do it again before they can run away. You can usually get a lot of use out of one bandit.