You shure can make nice models,
but what type of multiplayergame do you want to make?

A LAN based type of Diablo game, or an Internetbased type of
Multiplayer RPG with more clients?

Does it have to a a Multiplayergame?
If yes, do you want to stick to 3dGS for it?

Or is it just to make a prototype to show your ideas in action?

This is most important to find a programmer for it.

You should also look for a leveldesigner only after you have set up
the requirements for the gamelevels,
as this defines how the level should be constructed.
(BSP, or pure Model-level, or a Mix of them)
That defines if the leveldesigner must be more skilled in BSP or Modelling.