Hi I have been working with kindle and books for over a year now, yes money can be made and if you treat it right lots of money. I write, format, and do the covers for the books with a partner who also writes. some points may help always use images you have the rights use, for covers, Erotica is a good place to start because you can get away with 5000 words and sells ok , one thing that can make good money are YA series, as for marketing create blogs, twitter accounts under the author and grow them. its been noted that the more books you have out the more you make, treat it as a long term growth and you will get rewards. also just to mention if your outside USA you may want to look in to an EIN number to stop amazon keeping 30% in tax