Then, after taking in all the guru stuff, poor information, bad advice and note scam adverts, go talk to a finance attorney, if you have money to buy notes you have money for a good finance attorney.

Scam?

College is an utter scam for 98% of people.

Unless you can devote fair amount of time and resources to manage the project, there are a lot of ways a project like this can go wrong.

I just lost a significant amount of money with a TAX LIEN CLUB that basically sold me their bad tax liens worth nothing in a state where I just could have bought the tax lien I wanted in the county of my choice.  But ...

You can do flipping as a part-time but it will require a lot of work and a lot of your free time devoted to ensuring that your contractors are on time and that your project moves swiftly and efficiently

How much time would I need to devote to my rental properties?

So not sure if the "tenants" were legitimately scammed or not.

This is not a scam or a joke.  

One to rent and one for an option to buy so I don't know why you would have to be worried about an installment sale.If you're worried about Dodd/Frank or the CFPB (scam that they are) work with a licensed individual or get licensed yourself.