I am a software developer by trade and am blessed to have an excellent career with a decent salary that leaves me with some disposable income that I'm hoping to put into some smart investments to generate passive income.

A firearm is not the only tool I have at my disposal for defense, but it is definitely one of them.Open vs concealed has been covered pretty thoroughly except for one point.

If they were disposing of her property, she did have the option of calling the police. 

Depending on how such things work for you, you may also be able to write off a pro-rata share of utilities, garbage disposal and anything else you pay for that is related to that rental.  

Sanitary facilities and a safe method of sewage disposal.

We offered to drive him across town to the Humane Society and were prepared to pay the disposal fee for him.

With disposable income, I would: 1) pay off any consumer debt, 2) Invest in any matching retirement accounts, 3) Fully fund ROTH IRAs, 4) Buy rentals.  

I also have private lender money at my disposal.  ...I am not sure how to move forward!  

Great choice in choosing real estate and like everyone else on this Forum, BP is a great community with countless resources at your disposal.

Avoid carpet in lower end as it becomes a disposable item.