Thanks for all the feedback.
I know this isn't going to be easy at all, and I knew from the start that this isn't going to be a project of a few months.. but close to a year maybe?
I'm studying Economy while having computer science in the back of my head.. I've always planned to keep it as a hobby, and these days you can find any information on the internet.. that's why chose not to take computer science in school.
I won't start by making a multiplayer game, though I will make a game that is going to evolve to that stage one day or another, hopefully..
So thanks for all your replies. Though the challenge is extremely hard, I'm not thinking about giving up, at all