When I'm analyzing a potential deal, I've been factoring leasing fee (1/12th rent per month) + PM Fee + 7.5% CapEx + 7.5% Repairs + Principle + Interest + Taxes/month + Insurance/mo + Vacancy (10%)... going with the thought that tenants in single family rentals will be responsible for mowing the lawn and all utilities.  

Note you cannot purchase title insurance on these properties until you pay for a clear title action which will cost you around 3k for an attorney to complete over a few months.

Insurance also seems quite low, keep in mind you'll want/ need liability coverage. 

Each has a homeowner's insurance policy with $500K in liability insurance. 

-Mortgage-Hoa-Taxes(fed/county) n/a city taxes-Utilities(covered by tenants)-Insurance; what types are necessary to calculate into monthly payment totalAny and all input would be gladly appreciated!

What is the insurance costs what about water sewage or garbage costs if there are any .

I will live in one of them and get FHA loan.Is there a formula or rule of thumb I need to follow to make sure it’s a good purchase based on the monthly payment I’ll be paying out for mortgage, insurance, & taxes.

You must tell your insurance company that the property is rented to tenants.

If it's an amortizing loan, the result of that calculation will be the chunk of the P&I payment going towards interest, with the rest going towards paying down the balance, assuming taxes and insurance is not impounded. 

You will certainly have costs that include title insurance premium, adjustments for property taxes and homeowner's insurance.