Look into nginx. See if you can make a basic webpage and access it from a different computer.

You will need to set up port forwarding, or use a VPN that supports it.

Good luck.

Check out !selfhosted@lemmy.world for questions about selhisting, and !lemmy@lemmy.ml for questions about running a Lemmy server

I’d recommend including a lot more details in your post about your machine, your budget, why you want to do it, etc

For necessary materials any old PC would work for trying it out. Old laptop, old desktop, whatever. Others linked the install instructions.

Running a full instance with active users is a different story, moderation and hardware upgrades become more of a thing.