My medical is $528 a month for a family of four (1-year plan, high deductible, $1M coverage per person) Like with most policies you get a discount, if you pay in full.

Are they single family homes or multiple units? 

In the Reno, NV market the single-family is out performing the multifamily because of the short supply and higher prices.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Cardinal Insurance Group is a local family owned agency that can most definitely help with protecting your investment property.

My wife and I have a large growing family and a home that perfectly fits our needs but want to expand our rental portfolio.

When applying for a loan for new construction, banks typically look at your credit history, income, and assets to determine your eligibility.

I am looking for the exact same (multi-family using seller financing).

The issue that you have, is that your guests experience will depent greatly based on the demographic that the motel building brings.I would pass and try to get a small multi-family building or see if you can buy the whole motel(to have more control).

Single Family and Commercial investments have been my interest lately.