I'm biased, but Omaha, NE is a solid market to invest in.

I recommend you reach out to a company like Corporate Direct to get solid advice on this and not try to piecemeal it together from various sources.

Starting small with solid fundamentals and not waiting for the "perfect" deal was key to getting started.

Basically a lot of circumstantial evidence (no video of her actually taking the packages).This evening an old car with an old man drives up my driveway.  

Is there any evidence or support I can include to make my letter of intent more credible?

If you have plenty of money then it probably wouldn’t matter how much the property costs, but for a $1MM+ property I’d personally want at least a 6-7% annual return through cash flow (15% or better preferred) and a pretty good idea that it’s going to appreciate solidly.

My advice would be to put together a solid plan.

Low property prices evidence this.

Happy to help with some advice and if you do a search, you'll find some solid posts I made on the space. 

They're solid.