The project looks interesting to me. It's challenging, It feels like fun. I have no experience in C language, nor Java (web frontend?). Development tools and server side stuff is a thing that need to be discussed. To clearify things, this is project that will take a huge amount of time if it will be written from the foundation. So I suggest Unity (C#) as a base for a client. And amazon services to handle server side. Before starting any work we will need a strict and detailed roadmap to understand where is the end of the way and where we will be at the end.
I can spend something like 4-5 hours a day working on a game.
Good things - I can handle every aspect of work in the project, but be ready to get some more freelancers to boost up development.
What's bad - I never worked on a MMORPGs, I was thinking to make something like that, but it is a huge amount of time, a lot and lot of work. I have a spare job but also have a lot of energy, inspiration and desire to make games.