Most lawyers who have commercial backgrounds will know what to put in such a document. 

Unless He has a proven background in Sales, very few lenders will touch him until he has an established track record.What I would suggest, is ask the relative if they would do an Owner Finance for 3-5 year Balloon Payment, if you are trying to make this happen in the short term.

Congrats on moving towards your goals -- with a background in sales you will kill it.There are so many ways to find motivated sellers that I literally have to just point you to these three blog posts I wrote:55 ways to find deals onlinehttps://www.biggerpockets.com/blogs/8814/72016-55-resources-to-find-real-estate-deals-online27 ways to find deals offlinehttps://www.biggerpockets.com/blogs/8814/71506-27-ways-to-find-off-market-and-wholesale-real-estate-deals-offline35 relationships you should build to find more houseshttps://www.biggerpockets.com/blogs/8814/72664-35-relationships-to-help-you-find-more-houses-to-flip-or-wholesaleCheers!

I am a wholesaler so I am familiar with the industry, but am nervous to begin this journey by myself, with no construction background.

My background in construction gives me fairly high confidence on the Rehab numbers, but I also know about the typical overages. 

I don't know your background or if you are looking to invest somewhat locally to Plymouth but I figured I'd throw it out thereKind Regards, Ryan J

Specifically, criminal background checks, credit scores, rental history, etc.

I would love to speak with anyone about their experiences and background with restate investing.

The house is in NJ.I  would need to do the background/ criminal and credit check for the new tenant.

Then depending on the year you can use that year's dominate interest rate.