Installation of WAX610

Appears you have some kind of a Web UI management connection to the WAX610, through what your security appliance is designating as LAN by default, on the 192.168.55.1/24 (wild guess) IP subnet, using a static 192.168.55.55 IP address.

Knowing nothing about your environment and configuration, however we can assure you that a pfSense can (out of the box or in it's default config state) handle an interface, here designated by default as LAN, allowing to connect a random computer (like the WAX610 for example with the default config. or fpr the sake for testing a PC), getting an IP config assigned, and beeing able to ping the default gateway for this LAN security zone and IP subnet, and reach the Internet via this new security appliance.

Before connecting more infrastructure like additonal switches or wireless access points, make the first steps and collect more experience with a computer or PC connected to this LAN port. 

There is nothing difficult, please understand such security appliances need some longer learning curve than the average home network consumer gateway. a learning curve we can't take away from you. Said this: You can always go back and keep things simple, and connect the WAX610 direct to the router making up the gateway on 192.168.0.x/24 for this pfSense installation - and everything, including the built-in basic monotoring for the Internet connection on the WAX610 does work as intended. Essentially, the same applies to an out-of-the-box install of a pfSense as a read-to-use appliance, or based on whatever platform using Netgate's pfSense Community Edition.