Good to have your company, David. One wee thing we now know is that you are UK-based. Kindle (unless its new UK site makes a difference) used to insist on some kind of 'official' US presence for publishers and self-publishing authors. There are ways around this by using an aggregator like
www.smashwords.com.
If that ain't the hitch, though, I'd follow GeoffC's advice above (he's also in the UK) and post the specific question in a dedicated sub forum here; maybe Kindle or Writer's Corner. I'm sure you'd soon get sound advice.
Good luck and best wishes. Neil