There seems to be multitude of sites to go to for this information, not all of it reliable.
Where to go to download old macOS Legacy
How to setup MDS Server (Modern Mac Deployment)
MDS is a tool by TwoCanoes Software for automating macOS deployments. It helps configure Macs quickly with things like software installations, configuration profiles, and workflows. It replaced the Deploy Studio build software for Mac deployment after 10.13 High Sierra
