I used to use STESSA but I’ve had a ton of issues with account connections with banks/loans breaking so it’s difficult to automate.

  $100M was written in the lease by previous, well-experienced landlord and assigned to me at purchase.In my research, I have had a difficult time trying to nail down exactly what the premium difference may be from $100M to $50M but with the recent surge in prices, the best data I have so far is in the range of $750~$1k per Million of coverage.... so anywhere from ~$40~50k/year. 

As you scale, you may find it more difficult to provide the sweat equity.If you can find a non Freddie/Fannie option that would work. 

"It is difficult to get a man to understand something when his paycheck depends upon him not understanding."

Many people will tell you that seller financing is rare and difficult to find; fortunately, that's not really the case.  

Unfortunately, I'm finding it difficult to find lenders interested in this, and terms that are less advantageous than I would have expected. 

Has anyone found it difficult to find investors as a new business owner/real estate investor?

If you haven't even gotten past rentals vs. flipping it will be difficult. 

@Chris Gomes this is a difficult thing to figure out when you are starting out.

I have heard flips are very difficult with that regard, but buy and holds seem doable to me and at a price more conducive to the beginner budget.