Here are some things that you should research so you can engage in effective Facebook marketing:
What age bracket will most likely be interested in your product or service?
If you represent an organization, what specific personal values will be important to potential fans of your organization?
What common interests are shared by those in your niche or market?
In what way does your product or service enhance the life of your niche/market?
How can you attract others to take interest in your product/service?
Why would anyone want to hit the “Like” button on your Facebook page and participate in any of your contests, surveys, etc.? What can you offer people so they will willingly participate in brand awareness campaigns, etc.?