There is no upper limit on any IRA investment when it comes to ROI.  

I have very limited experience and knowledge in real estate investing but I am always willing to learn something new and build on what I know to hopefully, one day become a millionaire.

Sub-2 looks real appealing but my knowledge is limited to what I've read on BP and google...

, experience in online marketing: SEO, PPC, Web Development (started my own business right after school), and some limited small time business consulting work. 

Once I know the limit I can create an offer strategy.

One will limit the loan size to $650,000 and the other $750,000.What you've described are terms that would be offered to a strong bank client who doesn't need the money to do the deal. 

I'm still very curious about the Library,  but don't have the resources now, I'm locked in a rehab and my time is very limited.  

Nice, sky is the limit!!

Underestimating the cost and time of renovations (usually with limited reserves to work with) and overestimating going rent rates.   

Very first one I did I had to stay in and do the rehab because Freddie Mac slipped in a deed restriction the title company didn't catch until we went to do the second closing (they weren't same day, I was doing the loan and the lender was dragging their *** so I funded it for my borrower)You used to be able to double close, but its limited nowadays.