You said you read in your genre, how many books on average do you read per week/month/year.
Probably on average one a week. When am not on my bloody phone.
Also did you have an epiphany one day where you thought this is it I'm going to write the book and nobody is going to to stop me?!
Yes, I did. At the end of my twenties I observed that a whole decade of 'writing' had amounted to about 15k words and I realised that, unless I changed something, I would never achieve my 'dream.' So I started a new book, and finished it in 8 months.
I have one more question though (or themes of question) - have you stayed with the same agent throughout (I am very flighty in that department)? Did you get the one you wanted? Did more than one offer you representation?
I have indeed had the same agent throughout. I had more than one interested but gave a time limit for offers and then went with the first offer anyway.
What's your favourite book you've ever read? Is there a certain one that made you think yes I can do this/writing is what I want to do?
This is too outing I think as I am quoted on the books I liked, and have also given interviews about my biggest inspirations.
Can you clarify- how far along would you go towards the finished product before trying to sell it?
If it's fiction, you have to finish it, I am afraid. Agents take on fully finished novels. Of course, most will work editorially with you, and then editors will too, but to stand the best chance of getting taken on by an agent you should a. Finish it, and b. make it the best it can possibly be yourself (so, with your critical eye). You can't do any more than that. It's very unfair, I know, to have to write 100,000 words with no promise, pay or validation, but I think that is the worst and hardest bit, and the part where most fail.
If you are quoted on somebody else's book, saying something nice, ("John Smith is my favourite fictional vet! " Chris Dodo, author of Vets I like) do you paid for it, or is it an exchange of some sort or is the same publisher or what? I've always wondered how that works when the person quoted is not a critic or potentially a friend.
No. No payment. What happens is publishers sent advance review copies to me (via my agent) and, if I like them, I will offer up a quote. There is no doubt a bit of strategic endorsement that goes on but generally speaking most authors I know endorse books they enjoyed because of just that - they enjoyed them, and it's a nice thing to do to offer a leg up - especially for a debut.