I recommend returning it and building a computer yourself. As complicated it seems, it's basically a 10 step process.
1. Unpack all your products. Put your motherboard ontop of it's box, NOT with the anti-static bag.
2. Place the CPU inside of it's motherboard socket. Install the CPU Cooler.
3. Plug in all the PSU cables using common sense and the mobo manual. Plug it into the wall.
4. Insert the video card. Plug in a keyboard and/or mouse into the motherboard, and connect the video card to a monitor. Short the two powerswitch pins with a screw driver. (Have them connect through the screw driver.) Turn on the monitor and the motherboard's logo should pop up onto the screen. Turn the computer off via PSU switch. If everything works right, continue.
5. Insert all the fans, optical drive, storage, other accessories and motherboard backplate into the selected case.
6. Think how you are going to route all of your cables.
7. Take off the video card, unplug all of the cables from the mobo and PSU. Insert the PSU into the case, screw it in.
8. CAREFULLY place your motherboard into the case, mounted with standoffs. Screw it in.
9. Plug everything in, insert the video card. MAKE SURE to use the mobo/case manual if needed. Double check everything looks fine.
10. Turn the computer on, via case switch. Everything should work fine. Install your copy of windows, and tada!
If you do plan on building a computer, please watch the first 3 video's newegg has. They will help, ALOT.
https://www.youtube.com/results?search_query=newegg+tv+how+to+build+a+computer+part+1&oq=Newegg+TV+how+to+b&gs_l=youtube.1.0.0l4.43.5456.0.6653.14.12.0.0.0.0.764.6194.1j3-2j1j6j2.12.0...0.0...1ac.1.11.youtube.5OEYpZvgFr4
However, if you can't return it. I HIGHLY suggest the MSI GTX 760, it is the best of the 760's. The 760 is one of the most recent and best, if not thee best, bang for buck videos card. 249.99 with rebate. Later if you have a beefy enough PSU, you can get another 760 for 2-way SLI. And you can compete 2 250$ GPU's with a 1000$ GTX Titan if you use them correctly.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127745