Also I may add, I am a real estate agent, so I can access MLS to gain information on specific homes but I'm not sure how to put it to good use.

It doesn't matter whether it's interest, dividend, passive, capital gains - it's all taxed at the same (fairly high) rate.

In other words, if one were to sell it right after it is built, would they have to pay short-term or long-term capital gains taxes?

The point of waiting a year is to avoid short term capital gains tax thus paying long term capital gains tax.

But as soon as you gain experience through life's ups and downs and get to the point where money isn't a problem anymore, you will get tired of the police calling you at 3:00 am because some dude decided to beat the crap out of his wife and threw her out in the snow and the cops want you to come down and open the door for them so they don't have to kick it in.

Big gains I see are NOT from cash flow.They are from finding value add properties in great locations and timing the market cycle correctly to cash out after full stabilization.A rural to one economy town semi-suburban areas might be cheap and have higher cash flow but it's for a reason.These areas are dead towns that have minimal to no growth over decades.

One just for the SDIRA and one for personal gains.

I'm going to call her current landlord tomorrow as well as he place of employment to gain some more comfort. 

One day, with a lot of handwork and gaining knowledge day after day. 

I'm here to learn what I can from everyone's experiences at the same time offer any insight that I have gained over the last few flips I've done.