Sources for insurance and property taxes: Insurance—ValuePenguin, State Property Tax Rates—Rocket Mortgage.

There is no pass on the taxes.

Don't forget to add fringe benefits such as health insurance and also payroll taxes, etc. 

The issue is my taxes show very little income.  

You can - 1) establish a trust for asset protection, 2) utilize the Homestead Exemption for property protection, 3) consider tenancy by the entirety for marital property (this might just be applicable to California, my home state)4) make sure you have adequate liability insurance for additional protection, 5) think about forming a business entity to shield assets, 6) and have proper estate planning for asset distribution.Seek tax and legal advice from experts in your state.

You make this election when filing your federal income tax return.

Make a buy at a Nebraska Tax auction on just the taxes.4.  

Because high rental yields, tax free income, and stable market. what do I have to learn first to start investing on Dubai's rental properties? 

I do see pre-foreclosures, pre-probates, and tax delinquencies.

When I die, they can keep renting out the properties or move into the SFH, or take the step up basis and sell it with not as high of a capital gains tax hit (I hope they wouldn't choose the 3rd option).