QDMA is a good resource. Kind of Deer specific, but many of the tips and strategies carry over to many animals.
There are many game specific organizations, Ducks, Turkeys, Upland Game etc.
I was lucky and found a couple of mentors over the years. Happenstance more than planning. One was a guy who worked at the same place I did, maybe twenty years my senior. I'd invite him for surf fishing and he'd invite me on hunts. The other was a guy who was dating the same girl I was dating, when we found out about each other, we decided hunting was more important than she was.
We were fast friends and hunting buddies for many years, he taught me a lot.
One thing that helped is I was a good shooter before I was a decent hunter. A lot of people go hunting without the skill sets to accomplish much. A good shot who is a poor hunter, can be more successful than a good hunter who is a poor shot.
The shooting range can be a good place to meet people, though many hunters are slow to share their hunting spots, most are quick to share their knowledge. Same with the gun stores.