Books on Calculating Expenses?

[Forrest Baker]

I plan on purchasing my first rental property (SFR or 2-4 Units) in the next 6 months and want to prepare the best I can. I've read a couple books but I haven't found a book that shows you how to really analyze expenses. I'm hoping there's a book that can give general estimates, percentages, rules of thumb, etc. to calculate expenses. Obviously each property varies greatly but there's got to be some good material out there right ?

If you have any personal experience or insight I'd love to hear your recommendations!