To get started with Android/CyanogenMod, you'll need to get setup your enviornment.
To initialize your local repository using the CyanogenMod trees, use a command like this:
repo init -u git://github.com/marignygrisgris/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
Once the repo's are synced you will need to get the CyanogenMod prebuilts
vendor/cm/get-prebuilts
Then depending on what device you are building for you will need to run the following
GOGHSPR - Sprint Version
. build/envsetup.sh && brunch goghspr
GOGHVMU - Virgin Mobile Version
. build/envsetup.sh && brunch goghvmu