I want to start facebook,where should i start to learn?

Personally, I've found the case studies made by adespresso super helpful. Generally any kind of facebook case study will give you actionable information. It's much better than reading tons of filler article content.
By starting Facebook, do you mean monetizing or just plain creating an account or a page? If the answer to both is yes, just Google it.

Please be more specific so that we can help you out.
There are a lot of interesting sites and blogs, that helps to start you own activity. What I can say - try to be tolerant, do not hurt anyone feelings and no 18+ content!
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