ADS-B Exchange has a very active Discord channel where they will help you pick the right equipment and walk you though the setup process. https://discord.gg/JJ6QC4c
There are a number of places, ADS-B Exchange sells a preconfigured kit on their website. If the location is one with weak coverage they may even send one to you for free, definitely worth reaching out to them if nothing more then to ask about a bulk discount.