BP Rental Calculator - Entering the correct inputs/numbers

[Sippy Hira]

Hi there! I just starting practicing how to analyze deals using the BP rental calculator - I watched the video on how to use the calc, but still have some questions (although @Brandon Turner makes it look so easy!). If the following details are not provided in the listing and because costs will most likely be different state to state, how do you determine things like: water & sewer, garbage, closing costs, management fees, insurance, etc. Is there an average percentage for each of these things that can be applied based on location and cost of property. I just did my 3rd analysis and this deal looks like it's a hit, but I really don't trust the numbers b/c I don't know if my inputs were accurate!

Thanks! 

Sippy