You are defiantly going to want to change things the more and more you mess with it and as your experience level goes up. I originally had an angled foregrip on mine but the more and more I played around I decided I liked the BCM Gunfighter grip on the front of mine. But you have all the basics you need The bare bones on a rifle in my opinion is in order Sling, Optic, White Light.The important thing to remember is, you'll change things constantly and this journey will go on and on. The parts bin doesn't feed itself.
All in all, you have a great starting point. Get out there and run it! Did anyone mention buy ammo? Then more ammo?