Powerline adapters usually come with a pair of short (6-8 ft.) ethernet cables, which will be all you need unless your PC or router is far from an outlet.
You'll plug one adapter in next to your PC, run the ethernet cable to your NIC, plug the second one in near your router and run an ethernet cable between them, then sync the two adapters (usually by simply pressing a button on one adapter, then the other). Your specific model will have instructions in the box.
Your PC will treat it like a regular ethernet connection.
Cheers!