To get started with building Red Wolf Recovery, you'll need to get familiar with Git and Repo.
To initialize your local repository using the minimal-manifest-twrp omni trees to build Red Wolf Recovery, use a command like this:
repo init -u git://github.com/RedWolfRecovery/rw_manifest.git -b rw
To initialize a shallow clone, which will save even more space, use a command like this:
repo init --depth=1 -u git://github.com/RedWolfRecovery/rw_manifest.git -b rw
Then to sync up:
repo sync
Then to build:
cd <source-dir>; . build/envsetup.sh; lunch omni_<device>-eng; mka recoveryimage