Teaching at the University level

[Cheeseburrito]

Howdy!
My wife has a Master's in Communication from SNHU she earned 2 years ago. She made the Dean's list, etc. But she hasn't made use of the degree. She's currently working a new job she just got, and is earning 55k in Los Angeles. It's entry level and she was told there is little to no room for advancement when she got it, but she wanted less stress so she took it.

Now she wants to do what she's always wanted to do: teach.

Does she need any additional schooling to apply for non-tenure positions? Some postings ask for a sample lesson plan and such, how would she go about making one of those if she has never taught a class before?

I guess more generally the question is: how does one with an MA start a career as a college/University proof?

Many thanks!