With the out of state investing, you'll likely need to file a non-resident return in any state where you invest and earn income if they have an income tax, and may want to talk to your CPA about making estimated payments to that state. 

Credit check, income check, debt to income check, possibly requiring a co-signer as well to ad an other layer of protection.

What are some of the best real estate low risk strategies investing long distance/ Out of state that can produce reoccurring income?

One needs income to buy real estate .. so if you can make some income selling real estate you will also learn how to buy and sell it at the same time.. plus the connections you make can be life altering.there are many different income opportunities once you have a license.

I would just have LTR houses that I cash flow over $1000 each after expenses because I bought them cheap with cash  These are very close to passive, even self managed, because I have systems in place.STRs also run the risk of the rules being changed and areas becoming saturated.

Yes, Insurance is a tax write-off for a rental property.It is also true, that if expenses are higher than your income(not including depreciation) that it may lower your DTI Ratio.

- Time horizon- Cash flow vs Equity vs hybrid- Passive or involved?

You can also have your father or family to help co-sign as well if you need to show more income.

This has allowed me to build not just my real estate business but also a home services business which has really taken off and provides additional income streams for me between my flip/develoment  paydays.

Who's going to claim the 1098 interest from the mortgage on their income taxes?