Can you guys help me figure all the functions needed for my stock market simulator?

I'm trying to make a game that simulates the Stock Market like in Real life, but i don't know all the functions necessary to actually make the idea work. Can someone give me a list of functions that would be necessary or at least essential to create this simulator. I know it will be a lot of work, but i'm willing take the chance.

This is a website to request help for scripts, it is not a request site. I suggest you do research on the actual stock market, you can't just say you want to do it then do it. You're gonna need to know what it is, how it works, etc.

Please only use this site to request helps with scripts that are broken or you made a mistake and can't find it, or if there's a more efficient way to do it.