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.

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.

I'd consider myself an advanced, tax-savvy, solo investor with quite a bit of experience. 

The income (rent minus management) should cover the costs (principle, interest, taxes, and insurance) depending on the property's price point. 

@Loren SouersI'm going to lead with the suggestion that you consult a tax professional and an attorney.Generally speaking, you can put a rental property in a revocable living trust, which can help with estate planning and asset protection.

This means 20-25% for a down payment, and it has to be your money that you're using (verifiably in an account that belongs to you).Though there are programs that lend up to 90/100 to first-time investors, those programs usually don't work in Maine due to the rural nature.

That might create some tax issue/book keeping complication.If @Brandon Hall is around, he may be able to clarify if this transferring of funds is a nonissue or a big deal.

Know that the market you're serving does exist, and is like an underlying current that's being held back by walled garden that the government has only recently scrutinize.Zillow, Redfin and Trulia has all attempted at disintermediation and increase market efficiency, but failed due to the market powers that maybe.