Trying to plan out my first build, ~$800 Gaming Build

I'm planning on doing my first build, and I could use some input. I've been researching components, but if anyone can give me guidance, that would be awesome.

Approximate Purchase Date: Can't build it for a few weeks, would it be cheaper to wait until after Christmas to buy parts?

Budget Range: ~$800 USD would be ideal, but I could go up to $900

System Usage from Most to Least Important: gaming, schoolwork/general use

Are you buying a monitor: NO

Parts to Upgrade: New build

Do you need to buy OS: Yes, but I should be able to get a discount through my university

Preferred Website(s) for Parts: preferably newegg/amazon/other bigger retailers, but I'm open to using any reputable sites

Location: Georgia, United States - I'm close to a Microcenter as well

Parts Preferences: I'm not really picky

Overclocking: Yes

SLI or Crossfire: No

Your Monitor Resolution: 1920x1080

Additional Comments: Playing Skyrim, Battlefield 3, and other similar games

And Most Importantly, Why Are You Upgrading: Made a transition from console to PC gaming, but only have a laptop with a nvidia gt520, so I'd like to try out a real gaming pc

Thanks for your help!