Ok.
I’ll assume your pfsense is configured.
You’ll need to configure your Switch 1 with your first vlan, then your second, then your third as described earlier …
Plug your switch into the Pfsense box and ensure your interfaces, rules etc are set up correctly.
Then check you can access the internet over each vlan via different ports on switch 1.
Once you have Switch 1 configured as you wish, then move on to Switch 2 …