Hmm, I would propose setting things up in your LAN step by step. But it would take a long time.

• setting up your own dns
• setting up your own webserver

It’s something someone experienced could make (poc style - proof of concept) in an hour or so, just to show how it works, but it’s a lot for a beginner.

Still, you could start making a simple Webserver hosting a page and then setting up dns for it and pointing a client to the dna server and see how that works.