Check other books in your genre and sub-genre to make sure you are cuing with your cover correctly.
Check other books in your genre in book stores to decide which size is best to use.
Not exact matches
My recommendation is to
check to see what
other books in your
genre use.)
A quicker way would be to
check out
other similar
books in your desired
genre / topic, then connect with the Amazon reviewers of those
books.
It's nice to support the success of
other authors
in your
genre; you want to be careful not to share crappy
books (and I'd never ask anyone to do that: I'll provide a full copy or at least excerpts of the
book so they can
check it out before committing).
Check what
others in your
book's
genre are doing.
Using Google and
other search engines to identify
book clubs interested
in your
genre is a great first step, but you should also
check out
other online sources like Meetup.com, whose purpose is to help people interested
in common subjects make contact.
To help you learn more about your sales ranking
check out Ebook Tracker http://tracker.kindlenationdaily.com/ and compare them to
other books in your
genre.
Check out the descriptions of
other books in your
genre that are selling well.