Hardware - Start small and cheap. If you have it already use it. build it out as you need and understand it.

Software (OS) - Debian based perhaps. Docker probarbly.

Utilities - What would you like to do today? pick one, Pihole is useful.

Once you get something working for yourself, you’ll start to build on that knowledge.

Above all be brave and be curious.

You may be out of luck, but doesn’t that board have onboard VGA graphics which you can use?

OMV is a web page dashboard and there’s SSH. What is the usecase for a GPU I wondered?