Know how to take constructive criticism.

It'll be a sink-or-swim proposition, but that which doesn't kill you makes you stronger.She may find it's not her thing, but being able to talk to a lot of people is critical for getting deals done.Math on investment RE is not that hard to learn - Really. 

If you're a single mom with student loans, a car payment, and living paycheck-to-paycheck, then $20,000 would be devastating and a reserve is critical.

A successful comedian, and a professional critic trained in the classical arts, both go to rate a painting.

Some of the most critical elements to understand are the timeline for investment realization (example: 5-10-20++ years) the leverage and borrowing capacity and the age, income and portfolio of the investor.Investments and lives change.

Of course reliability and reputation are critical factors as well.Any recommendations would be greatly appreciated!

As @Henry Clark mentioned above, there are a lot of factors to consider in underwriting a commercial property and getting yourself educated is critical to avoid very costly mistakes. 

I will take any guidance and criticism as I am learning.

Or do we buy an investment property first and postpone having a place we own to live in, for two years, an especially critical question now with interest rates going up fast?

Understanding real estate tax is very critical as you can do something completely innocent that costs you 10s of thousands in extra tax.