Then decorate the place up, nice lighting, signs, etc.Then you can move the needle. 

They had cleared it, put some gravel in of some sort, fenced it with barbed wire on top, manual gate on tracks and flood lights in the corners.

C class investing, B class light value add, BRRR, etc... once you do that they will put the properties in front of you that fit your strategy. 

So I am not sure whether I really need sources of passive income right now considering that I have a lot of energy that I can spend on investment strategies that require more efforts and energy.

We tested it was not black mold and there were light spots with the lack of using the ventilation.

That doesn't include any maintenance costs or other variables.I regularly argue that solar energy is rarely worth the investment.

We had some clients that bought lighting at a flea market.

Check for stains Cigarette smoke can stain walls, ceilings, curtains, light fixtures, and lamps.

Evaluate the numbers and your time energy lifestyle for managing rentals out of state and how those align with your why you're investing in RE. 

maybe some light repairs after the tenant moves in...so your first few years after a purchase are typically stabilization, and you investing your money into the property.