One of the first steps I took was to visit the local chamber of commerce website. They often offer up-to-date information on businesses in the area and can provide listings of companies as well as contact information. Also, check out the Pittsburgh Library. Often these institutions have access to physical and digital reference materials that can be very helpful. If you are looking for something specific, try asking questions in local social media groups as well. Locals are usually willing to share information and experiences. Good luck with your search!