Many people will not buy books when they find out it has been self-published so don't tell people your book is self-published.
Create a fan page for it on facebook. Get yourself a twitter acct too. And link the two together. Post stuff about your book on the fan page and some samples, etc. Join Pinterest as well and share your book on there. It's always great to have a website so make one for yourself if you don't have one already. You can make one for free at webs.com.
Place your book onto book sharing sites like goodreads.com and weread.com and create an author profile there.
Also join google+ and talk about your book there.
Hope this helps a little and gives you some ideas.