Start small first, by approaching your local bookshop(s) and asking for their help by stocking the book sale or return, they will be the ones who will sell your book in the end. A good bookseller recommending you is invaluable.
People you know will be the first ones to buy the book, so have it available close to them. Don't give any away!
Get some free advertising by organising a launch in a bookstore and inviting local press, they love that sort of thing.
Find an angle (your book, you, your past) and use that to sell your book for publicity with national media. Have no qualms about shamelessly prostituting yourself if you want to sell. Principles are for when you can afford them.
If that all works, a publisher may offer to take the book on and promote it on your behalf, leaving you lots of time to do signings, interviews and write that difficult second book.