If it's a game with any kind of movement, you don't want to use phonegap anyway. If it's a puzzler or something, then it might work out.
In a nut shell, if you are not using Phonegap Build, it's a process. You will need to learn some Eclipse on PC and Xcode on Mac.
This is a little out of date, but still worked last time I used it.
http://www.adobe.com/devnet/html5/artic ... droid.html