1st, you should get the gun and shoot it a couple hundred rounds. Pretty much any type or brand of ammo can be used, but alot of us avoid Winchester. Alot don't.
It depends on where you live what you can hunt turkey with. In NY no shot larger than 2, which makes buckshot illegal to hunt anything with as it was banned for deer hunting 3 decades ago.
2nd, that also depends where you live, but you should shoot it to get used to using a long gun and read, read, read. Decide what you want to do to it from there.
3rd, red dots are good well past 100yds. Again, search and read past posts on