Whatever service you're in need of, whether or not it is related to your property, it's always a prudent move to do a bit of research and then create a shortlist of "eligible candidates." To find the right property management company, identify first which category your property falls under: residential (single or multi-family), commercial, industrial, or special purpose (sports venue, theater, senior home facility, etc.). From here, you can narrow down your search.
Once you have a number of property management companies in your list, it's time to talk to each one in person (or in a live, virtual environment). Do not accept property management services from anyone without personally talking to an actual property manager from the company.