To get started with PAC in Black, you'll need to get familiar with Git and Repo.
To initialize your local repository using the PAC in Black trees, use a command like this:
repo init -u git://github.com/PACinBlack/android.git -b cm-10.1
To sync up:
repo sync
Then to build:
./build-pib.sh <device_name>
example: ./build-pib.sh urushi