To get started with manifest/NeutronOS, you'll need to get familiar with Repo and Version Control with Git.
To initialize your local repository using the NeutronOS trees, use a command like this :
repo init -u https://github.com/neutronos/atomic_manifest -b eleven
Then to be sure to add device stuffs in local_manifest and then sync up :
repo sync --force-sync --current-branch --no-tags --no-clone-bundle --optimized-fetch --prune -j$(nproc --all)
$ . build/envsetup.sh
$ lunch neutron_$device-userdebug
$ m bacon or m bacon | tee log