Also would I have to pay an attorney to look over my contracts before I start having sellers/buyers sign them.

Ricky Ozbirn type the @ sign then find the name of the person.I would try to minimize debt for your son

Sign a new one year contract and hope for the best.

Remember that most things start to give you signs they are failing month or years before they actually "let go" so if you are often repairing a large expense item be wary and contribute more to your buffer.

They usually have 24 month zero interest terms and if you sign up for a pro account you can score more discounts and deals.Good luck!

I've been doing it for a few years now and definitely know my way around a transaction. 

Also, what do you guys estimate closing costs to be on a transaction like this with a double closing?

My preference would be to "learn the ropes" from someone for my first couple notes but I would still want to provide value in some way and would want the transaction to be worth it to them as well. 

They scanned the sidewalk, backyard, and checked the basement and outside around the house for signs of oil piping.

I sign on the HELOC today and all is well, other than my bank account being $700 leaner...lol.