Being a young guy out of Cleveland, with more than 1,000+ RE SFR & Multi transactions, in numerous capacities completed, my track record is vast and knowledge capacity is wide.

If individuals want to lend less it would be an un secured note.We provide our lenders....Purchase Price Info, Property Address, Projected Rehab Costs, (typically just total amount) ARV.For security......Promissory noteMortgageAdded as an additionial insured to insurance policy.For a 5,000 note I dont provide any additional security, as it would not e tied to a specific property. 

I have no doubt that if I could find an accredited investor or non-bank lender I'd be able to secure funding.

They are senior to their debt, so they can crush, make sur there are's any other secured interests on the property. worth the $100 or so for a prelim title report. 

I have found some sites provide considerable due diligence type information and others treat it like a national security secret. 

I have an ITIN, but no Social Security number as Immigration just delay and delay.

Turnkey can actually mean a spectrum of things, and is a term very widely used to the point it can be meaningless.  

Otherwise I go through after they leave mark up the security despot and send it back. 

3. is it OK to ask a tenant to bring a certified check, as her security deposit ?

If not, he can sell it to you and carry back a note secured by a 2nd deed of trust.