Good for you, Naomi! Nice to meet another self-publisher here. I've done this both independently and with the company - Goldenford - which 3 other writing friends and I set up in 2004.
Promotion is always a tough one, and we're constantly struggling with it. I'd do anything and everything which gets your name out there - within legal limits of course! Contact your local papers, local radio stations, local shops (we have some of our books in small local independent shops), vineyards (yes, they do take them - especially with an alcoholic theme, which 2 of Goldenford books have). Ask your local bookshops re signings/launches etc. It's worth while cultivating those contacts and making good use of them. Ask about reading groups, and if people want your novel as one of their "set books" - offer discounts of course.
And don't forget the web - if people tell you they love the book, ask them to do an Amazon review. Send the book here and the Writewords review process will also get it reviewed for you. Develop your website, set up a blog, and every email you send out should have a signature advertising your book and with a link as to where to buy it. Myspace.com is also a good networking tool - we're finding it very useful. If you get a good review, email everyone again telling them, so they have your name & book at the forefront of their minds. Is it an ideal Christmas present? Tell them this and give them a discounted offer for bulk buying.
Get flyers done, and send them out in every letter & Christmas card. Yes, that includes your credit card bill. Pop the flyer into people's letterboxes locally. Give your friends flyers to hand out at their work, amongst their friends etc. Tell all your friends about it - no freebies - make them buy!
Try to get onto stalls - markets or book festivals can be useful, though this is expensive. Does your book have a theme? - if so, utilise this (eg if a book on the Civil War, contact every Civil War society in the UK and send flyers.)
Keep feeding the local radio/newspapers with snippets about you and your book over the months to come. If you can, do articles for the writers' press, and always make sure you mention your book.
Good luck! And when your next one is published, use unsold copies of the first one as special offer enticements.
Most of all, enjoy! - you'll never have this amount of power over your work and justifiable pride in it again (until your next self-published book!). The mainstream-published people don't know what they're missing!!
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<Added>PS - as you're childrens' lit, then try to get readings in schools too - ask Nik Perring (on site) for advice - he's a wow at this!!
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