Welcome to the Brotherhood of the Black-Gun!
My advice, and personally, I think the best advice...
1. Shoot woodchucks with it.
2. Take it apart/break it down, become familiar with the slang BCG = bolt carrier group, Zombie gun = tool for post-apocalyptic time etc.
3. Shoot some more woodchucks.
4. Oil it some (sounds important)
5. Practice good mag retention (avoid smacking your lips)
6. Shoot some more woodchucks.
7. Buy a LOT of ammo! You know, by now, what shoots best (at least for woodchucks).
8. Consider an optic: Is she a zombie gun? or a bi-purpose Barbie?
9. Oil her a bit, shoot her till she's hot and -
10. Put her away wet!
Enjoy that Black Beauty!!!