So there are no local stores you can go to and ask them to build one for you?
A relatively pain-free first timer option could be to buy a relatively cheap machine with a decent quad core CPU and throw in a GTX 750 or 750 Ti (check for models which do not require an additional 6 pin power connector).
We do usually suggest that you learn to build since it'll save you a good amount of money, but as a start you can experiment with something like this, just replace the rubbish GT 610 with a GTX 750/Ti, install the Nvidia drivers and it should be ready to game.
One thing to bear in mind when it comes to prebuilt machines, their power supplies are usually lower quality and are not reliable whatsoever so replacing that with something from Antec/Seasonic/XFX/Corsair/EVGA would also be a good idea.
http://www.bestbuy.com/site/ibuypower-desktop-amd-fx-series-8gb-memory-500gb-hard-drive-black-blue/6980021.p?id=1218818471270&skuId=6980021
One of the user reviews states that it only comes with a low end 300W unit, so a better option would be to get a decent 80+ rated power supply and a better value card like the R9 270. Read this thread for an idea of the power requirements of a 750/Ti.
http://www.tomshardware.com/answers/id-2061335/300w-18a-run-gtx-750.html
By contrast, if you spent $600 ish building from the ground up, you can end up with a substantially more powerful machine.
https://www.youtube.com/watch?v=W4Js2A1qdB8
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