I know what I must to do, legally, to get past due monies and how to move forward if she responds/fails to respond.

Just wondering if this is legal and will get me into trouble later if they are indeed tenants who just trash the property. 

Gain an understanding what you are jumping into tax and legal wise

Also, you would have the property under contract before you market to your buyers to really prevent this from happening, so you would legally be allowed to sue them for doing so. 

Therefore, it stands to reason that in the state of Maryland, it wouldn't be legal for me to wholesale properties.I am not, however, licensed in DC or Virginia.

Again, how to check if those are legal? 

what are some legal ways to reduce my rental imcome?

Even though rates and down payment may seem high, if there is any legal trouble associated with that property, you can sleep at night knowing you and your personal assets are protected.

As someone who anal/obsessive about paying all bills early, it has always floored me that even some of the "nicest" folks with adequate funds (at least on paper) will not pay their rent or not pay on time.I suspect these are the ones who deliberately seek out private landlords to rent from hoping these landlords will not pursue them as aggressively legally as a large complex would. 

This isn't legal advice.