To get started with Android/CyanFox, 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/CyanFox/android.git -b cm-11.0
Then to sync up:
repo sync
All supported devices are built nightly and periodically as changes are committed to ensure the source trees remain buildable.