Amazon suggests a starting budget of $30 a day and a per click bid of $0.50. DO IT. Start with their suggested budget.
Then, it is time to experiment!
Put 1000 search terms up and run an ad for a few days.
Then go in and increase your budget by 50% for the campaign.
And then bump up the bid for each keyword that is getting you a lot of impressions. (Increase 50% as well.)
What we are finding here is that an increase in expenditure is resulting in a higher profit margin.
If you have a new book and are not happy with the sales and exposure your book is getting, I would recommend that TRYING Amazon AMS programs might make a big impact on your book’s exposure.