Estimating monthly expenses

[Masud Khan]

New rental investor and soon to be landlord here. I’m doing the math on evaluating properties and having a hard time getting realistic monthly expense estimates for a 2 bed/ 2 bath condo and/or townhome.  

So far here’s what I can estimate with accuracy:

-monthly principal and interest payment
-annual taxes (published in MLS)
-insurance (around $950 annual)
-HOA/condo fees. (Published in MLS)

Here where I need some help:

-what is a good annual maintenance and Capex budget?

-vacancy?

-when evaluating a property, do you factor these expenses into your monthly cashflow? Meaning, should your rent also cover maintenance, upgrades and a vacancy amount?

All help would be hugely appreciated!