Try to be methodical from the beginning.

Sometimes an appraiser might also use the cost comparative method (cost to replace the asset). 

Partnerships, HELOCs, and hard/private money are popular methods of funding deals along with seller financing.

However, I would recommend reading this article, Triple Net Lease Investing (NNN): The “No Toilet” Method to Real Estate Investing, that explains the mechanics of net leases properties.

I don't know which method is the best.

No taxes ever owed if you sell by method of a tax deferred exchange or just re-fi to get your money back out.

Where you can get at least the address from the lien on-line, even if I must use other methods to discover What else is on the title.For now I want to buy Liens on Occupied properties with performing mortgages.

And, having paid taxes once inside the IRA you get to pay them again when you withdraw the money.Originating loans in an IRA, OTOH, is pretty attractive.

What is the best cost-savings method to take for insurance?

SFRs are priced based on the comp method, not the income method.