Things such as taxes, insurance, property management & landscaping are relatively stable but will vary per property.

Make sure you get full pricing from any of PM you speak with ---- they tend to vary (i.e. one could be 10%, but there are no "add ons" so to speak, and another could be 7% and have alot of additional charges). 

I've had wayfarer, houzz, lowes and others come through in my categories.

@David Antunes Price to rent ratios are going to vary quite a bit by location.

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But that all varies based the specifics as always.

In New London- like New Britain, you really have to be careful on what streets you invest on, it really does vary street by street. 

I will just share some of the conventional wisdom, it can vary quite a bit depending on the specifics of what you own and how you like to operate.

Then you can use good accounting software to keep various funds and expenses in separate categories. 

Prices will vary widely and you need to know why that is.