From the AP connected port side it will depend on if you are running Mobility Express using multiple VLANs or not.
Check out this deployment guide:
https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-3/b_Cisco_Mobility_Express_Deployment_Guide/b_Cisco_Mobility_Express_Deployment_Guide_chapter_010.html
Around the rest of the switch config you will need to configure the VLANs and SVIs for your required networks:
Guest, Management, Corporate traffic etc
If the Guest traffic is going to route through the firewall, you will either need to utilise layer 3 on the switch to route the traffic to it or use the firewall as a trunk so the gateway for all VLANs live on it.
You might get some better understanding of the switch side in the switching forum area around the basic config template and sonic firewall.
Check out this community post as well:
https://community.cisco.com/t5/switching/switch-trunk-port-to-sonicwall/td-p/3011358
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