Any guide to teach me how to creat localserver?

I just want to creat local game play by ownself
How can i creat the localserver that only play for myself ?
Does it have any guide easy to learn ?
Im computer stupid , sorry about that :feelsbadman:

You could search on YouTube for "create opennos server".
But the source is not play ready at all. There are many things which missing.
Run and kill chicken should work :lul: