Regardless of how much you read and research it ends up being trail and error....So in my opinion just jump into the deep end, I’d rather be swimming and struggling then watching on the sidelines wishing I was swimming. 

Start off by networking and watching as many podcasts as you can - as there is so much to learn!

What would I need to watch out for to be sure I don't break any rules? 

Carefully look how long the lease is for, the strength of the operator, if the lease has recourse (personally liable), and if convenient - - watch and see if the business is busy.One of the main risks for a NNN property is what happens after the business goes out of business. 

This was my first time and I really enjoyed my experience and now I am considering a second project - this time a flip - and I am actively looking for an opp. 

So in general, what should I watch out for or should keep an eye out for?

As you read these books, watch the biggerpockets podcasts.

Thanks, I’m already enjoying this platform!

I'm assuming you have no experience buying notes so you should read a few books, Invest in Debt, Note Investing Made Easier and watch all the podcasts from Scott Carson. 

That said, I really like looking at them as it is always interesting to think what can be done when you buy a building at $2k/unit.Feel free to use me as a resource to bounce questions off of, I am working with a few other new investors and I really enjoy getting people started. :)