I plan on mailing the letter certified and I wanted to know do landlords also call the tenant as a courtesy to let them know about the letter. 

If you are nearby, if you have ever been a pizza delivery person, maybe deliver a pizza to the wrong house that may or may not be the one being foreclosed on so atleast you can see inside a small portion. we used to just go knock on the door some folks would actually let you look around.

There is also a provision in the promissory note that states in the event of default, we must deliver the property back in the same or better condition from the time of purchase. 2: We will deed the property back to the seller & execute a contract for deed.

Does anyone have any machines or vendors that they'd recommend that would deliver?

Identify the need that you can deliver on.Grow: you, your income and opportunities will increase as you continue to do the above.Biggerpocket podcast is a good launch point.

Is it normal to pay anything upfront besides a down payment on Private Money Lender financing deal
Does this look legitimate to you guys https://drive.google.com/file/d/1WXAqllCuZVMjkv6HjqLmv-gw3bmwPqr2/view?usp=driv...

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Something that is increasingly important to those clients is being cash flow positive from day 1 and this is what we deliver.

Quote from @Tekoa Glover: I want to know if I am entitled to a denial letter if I am denied a DSCR loan.

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