The goal of a project like that should be to make it. There is no guarantee you will make money. If there was you would be able to secure funding relatively easily, in which case you should look into doing so.
I'm not wanting to discourage you from your project. Surely I might be wrong, there is not a lot of information to go on. But from the sound of it you want to make money from an indie game and that just isn't very likely. Especially if it will be your first game, and it doesn't sound particularly simple. Mmo's might be the hardest type of game to make.
Gauging honest interest in your game won't be possible until you have something to show.