If you look at bitcointalk only as a platform for making money then you're here for the wrong reason.
Could any one inform me about how to make a successful post and how long will need to success.
Do we really need to explain how to make a successful post lol? Simply state your opinions, or answer the questions of the topic poster. You simply need to make sense and answer with enough context. Campaign managers review your posts atleast once a week. So if your posts doesn't make sense, they can remove you from the campaign very easily. I suggest doing alot of studying about bitcoin and blockchain technology in general first before joining your first campaign.