How do I add a mainnet?

Excuse me, but could you please elaborate on the process of adding a mainnet? I'm a bit unfamiliar with the technical aspects of it and I'm hoping to gain a clearer understanding. Are there specific steps I need to follow? Do I need to have certain software or hardware in place beforehand? And what kind of considerations should I make when choosing a mainnet to add? I'm eager to learn more and would appreciate any guidance you can provide.