You're going to find it difficult to do hacks if you're a newbie - you're looking at one of the more complex ways to do it.
Here's a newbie's guide in one line:
Get an old PC, get some games, get an old cabinet, get an i-pac, plug it all in.
If none of that makes sense, google -pac and your world will open out from there. Either that, or buy the Project Arcade book and have an extended sit own on the toilet - you'll be there a while!