hunted boar, rac****, rabbit, squirrel and deer. Ate all except the rac****s, work with some guys that love **** stew. Haven't hunted in years, mostly because I don't have anyone to go with and I have a hard enough time getting my wife to take the giblets out of a turkey let alone prep meat I killed, even if I prepped the meat she'd flip out about anything that isn't procured in the meat section of a local grocery story.
I'd get some range time with the gun you plan on using and if your friend can teach you how to track/stalk. Learning how to construct a good hide is good skill as well. Depending on what kind of conditions, location and how long you'll be out you'll be hunting in I'd consider doing a survival course and land navigation training.
For animals like bears where you'll have little room for error I'd consider getting a guide to help you. I know a guy that years ago hunted polar bear and if it wasn't for the guide he'd most likely have been killed by the bear.