Help,I want to create a forum from 0

Thank you,
Icame here after a week reading, my specialty is journalism.
This ruby ​​programming language is the one that has convinced me. I hired a domain Foro0.com that is the only one I saw available, I hired a very cheap vps. Now I am looking for a way to connect to the server, maybe I install ubuntu on my the computer so that the server and my computer have similar operating system.
Although I do not think I will be able to make a forum like this but I will try, thank you very much.
How much can it cost more or less to make me a forum like this?