My accounts aren't old enough t get approved for higher limits such as 25k and up.

There is a limited and standard.

Particularly if you have limited experience. 

My experience is that Sch C in these scenarios is reserved for hosts who do provide substantial services in connection with the property, to include but not be limited to, linen cleaning, maid service, B&B type services, etc. 

We Have one friend who is experienced in investing, and knows how to get off market properties, however admitted that they only have part time and limited availability due to some family issues.

Trying to do flips would be very complex and difficult if not impossible within the IRA space with limited capital.

I believe you can even pull the FHA Duplex Loan limit to turn a Single Family Home into a Duplex.My gut tells me this is a very powerful tool that I haven't cracked the code on fully, just yet. 

High purchase price also severely limits your exit strategy if you need to sell within the first years.I've bought TK myself, and some have worked out fine, but some have had evictions and big turnover expenses.

I'm also limiting myself on area because I want to invest close to home as I plan to manage the properties myself until I get a big enough portfolio or get big enough properties to outsource the management. 

To generate income outside of the retirement account, you'll need to invest your own (non-retirement) funds, possibly using financing and/or partnering with others to get started if funds are limited.