You'll need to clearly define who it is you're looking for. What particular roles are you looking from people to fulfill? Do you need a spriter, RPG Maker adept, other programmer, or entirely different developer role filled? Additionally, what will you offer to them? How will they work alongside you, will they receive in-depth details about the project, will you create a site for the game and need moderators, how many people are you actually looking for, etc. You can't be too detailed, so include lots of information about your game.