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

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

repo init -u git://github.com/PoPfanICS/android.git -b ics

Then to sync up:

repo sync

For more information on this Github Organization and how it is structured, please read the wiki article