I have been thinking about this for a few weeks and i thought id ask on here to see if i can get a team together.
I been looking at this: http://mmorpgmaker.org/index.php?title=Main_Page
Its abit like pokimon but you can make it how you want. With your own quests. I did it a few years ago but it ended up just me building the worlds. So i packed it in.
Its online based and quite good. Easy to use.
I have everything we need to get it started (hosting, server) just need a domain.