Welcome to the boards!
I think you've been blessed. When I was your age, I always wondered why folks thought that if you dated somebody once, you were an exclusive pair, and why more people didn't seem interested in dating multiple partners. There wasn't any term to describe what I thought should be the way to approach relationships--and there certainly weren't many poly folk to be found in the backwaters of Iowa!
As far as hands-on learning goes...well, with poly, the only hands-on approach is to date more than one person at a time. It'll take some time to figure out if living multiple relationships at a time works for you. And make certain that you never mistake it not working for other people meaning it doesn't work for you.