5000 Facebook likes needed

I have developed a facebook page for a book which I have written which is essentially a self help financial book. The facebook page has around 650 likes to date but I am keen to get to scale quickly. Although the facebook information originates from Australia it is still relevant to everyone all over the world with a passing interest in finance. I post a facebook comment 1-2 x a week and am interested in building a growing following before I move into other forms of social media. The target from Freelancer is to get an additional 5,000 likes on the facebook page.