You have written your book and Self Published it. Like everything new you now need to start getting people to look at it and persuade a percentage of those visitors into purchasing it.
However the problem always starts with ‘How do I get people to find my book’? Just putting it on a list of self published books in and online book store will probably not result in many views. Somehow you have to start promoting your book AND yourself as the author.
If you are serious about selling your book then you need to put the serious work in to promote it like any new business. If you are lucky enough to get a traditional publishing deal then SOME of this work will be done by the publishing house. You and your book are the brand and you will still have to do a lot of work to promote both.
Social Media has made the job more accessible to everyone with Blogs, Forums, Twitter, Facebook and many others.
I suggest you take time to read the following article which provides a great starting point to using Twitter for marketing you and your book and building visibility and traffic – http://bit.ly/gq0V6j