Any specific blogs, people or places I need to plug-in to learn?

Be careful - follow the laws specific to your area.

So then I decided to look into the possibility of opening my own practice and specializing in Real Estate specifically.

More specifically Franz Schubert’s Trout Quintet.

If actions by the tenant in a NNN lease leads to a contractor placing a mechanics lien on the property, and assuming the lease agreement does not specifically address this scenario, what options are available to the landlord to resolve this?

I rent specifically to contractors working short term jobs at a local petroleum refinery.

You'll want to explain to your agent what your buying criteria is, confirm your financing and overall strategy, and then start analyzing deals. 

Maybe talk to a real estate agent or financial advisor to get some more specific advice tailored to your situation.

@Bianca Nunes what criteria & process did you use to select your current PMC?

There are even lending programs specifically for this.4.