@ifrit At the stage you're at right now I think the most imperative question you'll want to ask yourself is "what do I want from this project?".
If you mostly want a discussion then this can be as good a place as any. You can shoot ideas, other people will toss their own, and it can be a lot of fun if you're content with this whole thing remaining at the brainstorming phase. At this level it's similar to creating a table-top campaign since it can live entirely in someone's head, and the upfront commitment in time or effort is somewhat small, and mostly enjoyable for all involved.
If what you're after is collaborators to actually shape it into a potential game - as in, for it to have any chance of becoming a MUSH - that's where the investment starts piling up. To do so you'll either want to call on people who already know you or impress those who don't with your creativity, work ethic, code skills... something to get them to invest as well. Building an actual MUSH is a lot of work, some of it not very exciting or 'fun' per se, so before folks throw in their hats they'll need to know it's not vaporware; you'd need to come up with concrete ideas of what the mechanics would be, if you have any killer OMG-features in mind... basically any way to generate excitement and get the help you'll need, if any. Creating a game single-handedly isn't easy, much more so if you haven't done so before. You'll need help.
You need to distinguish what your goals are, IMHO. Either way though, good luck!