How should I approach this? Looking to Get Started with rentals.

[Gerald Gray]

I purchased my primary residence  from a tax foreclosure auction about 2 years ago for 90k cash...(free and clear) Its currently worth about 250k. 

I also own a commercial building free & clear I got about 5 years ago from a tax auction. I paid 10k for it its worth about 100k

I currently have 1 mortgage from 2007 for 57k that was my primary residence before my current one that a relative has been occupying and making the mortgage payments on.

My credit score is 780, and I have about 40k liquid for investing. Im looking to get started with rentals to increase my passive income. 

Any suggestions...?