Call up some people or investors you know and interview them, make sure you're ready as well.

In my interview, they ask for $150-$175 per visit despite the size of the place.

See if they can help you find off market deals-Contact three hard money/renovation lenders to discuss terms-Contact 3-5 general contractors through referrals or BP to interview them-Attend two or three REI meetups this month to find a flipping mentor-Read three books on flipping houses

Let them know that you are interviewing others and trying to find the right fit to work with.

This is a two-way interview, so have a short list of questions to ask the mentor (What books do you recommend I read to gain a better understanding?

But now our property is no longer our primary residence and we have two tenants (both section 8), I foresee managing the tenants ourselves would be more challenging, that's why I think it's time we hire a professional.The only experience I had close to interviewing a property manager was a call with a local property management firm, didn't go with them because they were not responsive after the initial call.I would like to know what I need to pay special attention to while interviewing a property manager.

You may not know the markets, you may not have contractor or management contacts, or finding and interviewing either. 

Interview multiple Property management companies and don't be afraid to negotiate the asking prices.

Interview multiple Property management companies and don't be afraid to negotiate the asking prices.

I didn't interview that many And we didn't really know what to ask.