Setting up a Raspberry Pi arcade is actually really easy, thanks to a Linux distribution called RetroPie.
You don't need to do any programming or setup, just install the image on an SD card. This will allow you to use the arcade with a keyboard right off the bat. If you want to build a simple control panel with buttons and joysticks, you'll need a few things (but it's still not hard).
The video above shows you everything you'll need to know, but here's the run down.