He did his part, I did mine and neither were smart enough to question each other.  

You seem like a smart guy so read a few of the posts by @Arlen Chou  and Account Closed if you have the time.

I think that owner-occupying like the way you are doing it is a really smart way to go about getting started in real estate and it's what I did.

Smart investors have multiple exit strategies.

Hopefully they will be smart enough to keep building on it.

What if you required special access due to some accident and retro-fitted the entire house for wheelchair access?

Maybe you could get work with someone who is doing fix and flips and learn that side of the business, possibly start doing some project management for them or partnering on deals after you had developed that relationship and proved your reliability and smarts.

Such a smart and simple idea; exactly what I needed today.

My question to you, what is the best way to use these notes and is it smart to obtain multiple notes on 1 property to acquire multiple properties?

Welcome @Inesa Tomaszewski you've made a very smart move reaching out to the bigger pockets community.