Trying to crash course this in a post isn't likely possible.
Couple things that stick out, those Zillow property taxes? they don't matter. You need to call the assessors office and have them tell you what YOUR taxes are going to be as a new landlord. Spoiler alert, they are going to be higher.
Capex? You need to break down major items by service life. % of rent has nothing to do with it. A roof cost a roof. The roofer doesn't give you a break cause you own an inexpensive, section 8 building collecting small rent.
Rent boosts depend on what you can get away with in your local market.
Go to Rent.com or Apartments.com or other sites that show real rentals currently being listed in your market to see the reality of the market rents. Don't rely on Zillow rent estimates. Have to be leery of agents about what they claim for "market rents" too.
Tools? An excel spreadsheet and working knowledge or metrics and how to read/write a pro forma. Otherwise you are blind trusting someone else.