Any1 got a sweet idea of what i should put in my MMO me and my team are Putin together? im open to all ideas.?

we got a great thing going on. its going to be a web based site no downloads or anything so im taking ideas for our blueprints before we really get started because we are not putin any changes into it as soon as we start.the game will be medieval based game were you can customize you characters armor/weapons but well im at a dead end with ideas.sadly tho the game will not be done for a long while