To get started with Android/PvotOS, you'll need to get familiar with Source Control Tools.
To initialize your local repository using the PvotOS trees, use a command like this:
repo init -u https://github.com/PVOT-OSS/platform_manifest.git -b android-16.0 --git-lfs
Then to sync up:
repo sync
Please see the LineageOS Wiki for building instructions, by device.