If you have an accepted contract, the only thing I would really worry about is copies of all leases.If you are still underwriting and thinking of offering, the price is going to be more dictated based on your own knowledge and idea of what you can do with the property, versus what the seller financials state. 

However, I have received an offer on my property from a very good and trustworthy friend that I have agreed to accept.

I have matched both tenants to their Facebook page (not new pages) and their photos on their work websites.

I have looked at the DFAS website, and haven't gotten very far because I do not have their SSN.

Let them know you're the new owner, that you will be abiding by the lease terms they currently have, give them your info to be able to make payments, any website/payment portal platform.I would keep it short and sweet.

Bob Stevens/Prisco sells turnkey properties and has websites advertising a complete turnkey experience where they handle all rehab and property management for out of state and out of country investors.

You submit a letter of intent to get the property, do inspections first in New York after your offer is accepted, and after inspections are resolved, your attorney then writes the contract.

I find many of those residents tend to stay for long periods of time because it is so difficult to find properties that will accept their voucher.

Another search that can be performed easily is searching the county clerk of courts website to see if there are any pending foreclosures against your fiance.

A good way for a newbie to understand the variety is to visit a website like Crowd Street, ShareSFR, FinResi etc.