Stated simply:1) become an expert2) go Dave Ramsey, spend less, earn more, build up funds to investStarting by house hacking using an FHA loan is a good goal.

Your payment will simply be too high and your rent will not cover your mortgage payment (PI, AKA debt service) and all of your expenses (vacancy, PM, taxes, insurance, maintenance and repairs, and an allotment for CapEx). 

If you did you would be simply sitting back and waiting at this point with no concerns.

But there are things such as minor repairs (update a pipe on a radiator etc).As for why more than 6 units a year = simply to have passive income so we can take care of our kids, my parents and leave grandkids with something.

As the leasee, I dont see how you gain any advantage over simply owning it in your personal name

I had an inherited tenant simply open the units main breaker and flip the switch.

A few places I simply say ' no animals' 

Do I simply need to write it on the purchase contract?

I tried to get the grass cut today, and they had trouble, first because they were scared, second they were so much trash torn up, and the dogs wouldn't move so we couldn't cut part of the lot.We will see how it goes, if he decides to leave that will be fine, and if things stay the way they are it would be better if he did leave.

You would not need the additional income so would simply fold it back into your funds.