For a 6 year old your game is alright, but i also think you are too young.
For a MMO Game you need a really large Team and alot of experience.
I would also recommend to start a bit smaller:
- Start with a Arena Game (1vs1). You will have enough to do building the fight mechanics, animations, UI, models, enviroment, aso.
- Then you can add AI Enemies to the Arenas.
I think a Arena Game is pretty simple and also a good start. It depends on your team how long it would take to finish something like that.
Let’s say you are 5 people. 1 Animator, 1 Modeler, 2 Programmers and 1 Concept Artist.
I think it could take a 6 months to polish everything and finally have a playable good game. Not perfect, but something you could share with others. And you will also learn a few things about the structure of a game, how to organize, solve problems, aso.
I think it would take about 10-20 times longer to finish a polished MMO game (so about 5-10 years).
You don’t believe me? I want to mention “Path of Exile”. It’s a Diablo like MMO.
2008 they started developing with a team of 10-20 people.
2012 they started beta testing and polishing the game (bug fixes, balancing). (about 20-30 people in the team)
2013 they released the game and also increased their team to 40-50 people.
Any Community MMO Project will fail sooner or later, because of soo many reasons. I really recommend to rethink about your game idea and work out a smaller project. Or join an existing game project and gain some experience, before you start a MMO Project.