Is it enough to just visit a couple time to get validation on desired location or is a 6-12 month stay needed?

She desires to "break even."

Here is an excellent article on housing market expectations on appreciation from one of the world's top investment banking firms Goldman Sachs: What are some of the big differences you’re seeing among US regions?"

Financing the deal with private money was effective for quick acquisition and rehab, which added substantial value by making the property more desirable for tenants.The main lesson from this investment was the importance of careful property valuation.

If you want to start big, you can reach out to local real estate groups or firms.

Hello friends! I'm Val, I'm a full-time therapist, part-time photographer and everyday creative looking to translate my skill set into house flipping and landlording. I recently renovated my childhood home while being...

Moving forward, setting firm boundaries in negotiations is essential.

Another vote for all the same firm - I have never actually seen a client divide up work based on CPAs in different states for different projects. 

What will it take to exceed the average rental in the area and create a desirable B class rental?

Just have to look at your resources and desires versus REI strategy.