Reddit reviews The Book on Estimating Rehab Costs: The Investor's Guide to Defining Your Renovation Plan, Building Your Budget, and Knowing Exactly How Much It All Costs (BiggerPockets Presents...)
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It's nothing you can't find online, but if you want it all in one book - I'd recommend the Bigger Pockets guys' book. If you don't want to pull the trigger (it's only $22..) read their website and their posts to get a sense of their writing.
http://www.amazon.com/Book-Estimating-Rehab-Costs-BiggerPockets/dp/0988973715
Read this book: https://www.amazon.com/Book-Estimating-Rehab-Costs-BiggerPockets/dp/0988973715
You can probably check it out from the library. You don't need all of it, just skip to the chapter on writing a Statement of Work. It will help you communicate with your contractor, and greatly reduce the chance of overages (but you should still plan for them of course).
Other than that, the best thing you can do is network a bit to find an awesome contractor.