It's great to scale but don't add doors just because without doing your due diligence. 

See below for explanations, with headings taken from the attached document.Broken windows or exterior doors-The two narrow windows in the living room do not fit into the walls properly.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

My point is, you are on the right track with your thinking, so now to the "HOW" to actually get in, if like me, you don't have an in or connection.First step is likely to get licensed, if you aren't already there are some other ways to get in the door and be helpful but licensed means they can pay you cuts of the deal and its less upfront cost and risk to them in helping you out.  

I've been a MTR/STR host for almost 5 years now with about 100 doors cohosting. most important for me are1.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

Kitchens, flooring, windows, doors, etc.? 

As for buy and hold, getting your foot in the door with a house hack is almost always what I recommend. 

Building real relationships with investors, brokers, and operators opened doors that wouldn’t have been accessible otherwise.

Oversized 3 car garage. 2182 square foot total.