To get started with Android/JellyBeer, you'll need to get familiar with Git and Repo.

To initialize your local repository using the CyanogenMod trees, use a command like this:

repo init -u git://github.com/AndyFox2013/android.git -b cm-10.1

Then to sync up:

repo sync

And to start building:

./jb-build.sh DEVICE_NAME

Or if you want to sync and build:

./jb-build.sh DEVICE_NAME true