My goal is to generate income since I am closing my business which is my 9-5.

There's a lot to unpack here... and it's not my goal to be a 'downer' on your aspiration... but just telling you my experiences to caution you about being new to the game...First - I don't think we know what state you live in, so just know that foreclosure auctions are handled very differently all across the country.  

I Prequalified several properties last night, so I know they still exist. 

You probably already know all this, or at least should but the last paragraph under landlord must give 30+ days notice (all must end at month end more than 30 days out, not exactly 30 days.) says there are legal requirements for tenant’s to give any notice.

I'm wanting to start to develop my rental portfolio for long term goals and retirement!

Going into a potential deal, I look at the track record of appreciation (sales comps) in the immediate area, not the general area, and based solely on properties that are within 10% higher/lower in sq ftg than the property I'm looking at.I have a goal of a specific number ()in dollars, NOT percentages) that I need to achieve in appreciation. 

My goal right now is to retire my fiance and try to be more in control of what we do in our lives when it comes to making money.

I have a few stubborn tenants who insist upon paying in cash and I make them take the money to my bank with a pre-filled out deposit slip with my name and the last three digits of the account number and then they fill in the date and the amount of the deposit.

If it used to be your primary residence and you've only recently moved out (ie it was your home for 2 or 3 (I forget the number) of the last 5 years), and the price has gone up since you bought it, sell it, avoid capital gains and decide what to do with the money.  

Then sit quietly and brainstorm and write down in considering real estate goals your 1 year goals, your 3 year goals, your 5 year goals, and your 10 year goals.