Get as much free/very inexpensive knowledge as you can.

But you don't need to be in expensive areas either.  

Will using a high yield savings account and your current savings rate get you the capital you need in the timeframe you desire?

I don't think we will ever have enough "doors" to replace an income in this time frame, but we would like to get to 5 doors in the next 5 years which we would sell in 10-15 years to help supplement our retirement income.  

Limit your risk by purchasing an inexpensive single family home that is completely conforming to be either an owner occupied or a rental.

There is normally a specific timeframe to do so when the values come out. 

All rules infractions have a point value, and if a resident accumulates X points in a certain time frame, there are several steps the manager takes to remediate the behavior i.e., curfew, no nights out, extra chores, eviction, etc.AH, eviction.  

It’s also the career tenants who live in inexpensive housing because it’s all they can afford who are far more inclined to take advantage of liberal landlord tenant laws and that's going to be a minority of the tenant base if you invest in gateway cities.

Once that is set, you need a cookie-cutter, inexpensive project 1. 

I bought top of the line if I say the name they might delete ,I like the  product a lot for rentals put it in expensive SFH and cheaper ones .