1) Editing did you pay for that and who did you get to do it? How much did it cost?
The first edition was edited by John Jarrold, who advised that I make a significant number of changes. He charged me about £500 for a line edit on a book of about 128,000 words. He also provided me with two side of A4 on notes and reactions to the writing and the story. John's a very, very good editor and agent, but be warned that he doesn't pull his punches. If he doesn't like something he will tell you straight and won't coddle you or your writing at all.
The other two books I worked on with friends, who acted as proofreaders. They still needed work, however, and I have since enlisted the services of a professional editor.
2) The free edition - you definitely think that was worth doing, was that edited properly ?
I think it was worth doing, as it allows people to get an idea for the story and the writing. It does mean that I can expect less sales for the second edition of HOTK (which to me is the more definitive edition). Still, it manages a few hundred each month on its own.
3)How many books do you have out ?
Two paid for, one free.
4)Why did you opt to self publish?
Good question. Firstly, because the story meant a great deal to me. If you look at the trilogy's website:
http://www.battleforthesolarsystem.com
you can see all the information on the characters, the world and the events that I'd put there. I would have done this regardless of whether or not I received a commercial contract, as I am very passionate about this story.
The second reason behind the self publishing is that I also wanted to prove to myself that I could write something that would sell and people would want to read.
On the whole self publishing thing, I've a split opinion. I think that there are now two markets available to writers - the cheap ebook market and the traditional market. I think it's important to recognise these markets and know which one a book is best suited for.
I saw someone state on an article for SFSignal recently that if he thought a story was decent, but wouldn't sell more than 10,000 copies, he could self publish it himself. Otherwise, he would approach the agents and publishers to give it the best chance for success that he could.
Self publishing isn't easy, and you could end up finding yourself out of pocket at the end of the day - editors and cover artists cost money, and you could find yourself needing to recoup £800+ just to break even.
Once I'm done with my trilogy, I'm planning on self publishing one other book (non-spec-fic), and then pitching a couple of fantasy books to agents and publishers, citing my ebook sales to see if it increases my chances of getting a deal.
Hope that helps. I'm sort of reluctant to encourage people to self publish their books, in case it doesn't go too well... :|