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but, where i can see if there is enough pepole that are intersted in that subject, and from where they are?

I got an idea to social facebook application.

anyone can give me a tips or tools or a book where i can get this answeres?:

• how to Find out if this niche has enough people that interested in this subject

• who Best Target Audience

• what Best Profit method (pay per month membership, AdSense, leads, etc...)

• What is the best market for this idea (country, languages, ages, gender, etc)

• where to Find who are the Competitors & Similar services / application and how to beat them

• a list of affiliate market for the related site niche?

well. i dont even expect someone can answer me that quesitons in this post but give me please links, clues , book, lessons or company that do that