Well if you can't afford to purchase some books on the subject (which are helpful in their own rights), then I would suggest spending time looking at Blogs that

Well if you can't afford to purchase some books on the subject (which are helpful in their own rights), then I would suggest spending time looking at Blogs that specialise in the subject and check out Reddit's marketing and entrepreneur subreddits. They are really helpful and you can ask what ever questions you need.