That can be as a sole proprietor on a schedule C or wages from a corporation you control, but either works.

For now, we rather bet on housing than stocks.Here's the dilemma.

If I have to make a bet between you and other people, I'll place my bet on you 99% of the time. 

 Steven, it has a low ROI because you have full equity in it, i wouldn't sell it. the property cash flows more than an average SFH ( average is about $400, some even get less or more). the ROI will change once you pull the money from it with a HELOC or loan. lets say you pull out 75,000 @ 4% HELOC ( usually they are based on 20 years ) your payments will be about $450 / month, you would still cash flow $200, the property is still yours, you now only have 35,000 equity in the house, your ROI will change based on the drop in equity you have in the house, and maybe the house will still appreciate ( which i never bet on) but know you can buy more property that will cash flow. from what i am guessing there are probably houses that go for 75,000 where you are buying, down payment would be 15,000, you could buy 5 houses with that 75,000 of equity you pulled out. just something to think about.

I'm assuming this may be a C or worse area?

I've found the 2% rule to be totally unrealistic in Texas on anything but C or D class properties.

We all bet on ever increasing value for our real estate, but a market correction could see you upside down in a snap. 

On the surface it looks like there would be tons of information it can provide you but the stuff that would be the most valuable they have little information on.

Never bet on appreciation. 

We do have a 0% down mortgage program for first time resident buyers (that can only be used once), but the property purchase limit is $200,000 and it is difficult to find multi-unit properties in this price range - unless they are in a C or even D area.