If you need a wired LAN for the new network, yes....that was just WiFi. You mentioned a switch, so I'm guessing you want to plug in a device now.
Next...what "doesn't work?"
At this point, you should have a new WiFi network that can reach the Internet and that you can apply adblock to.
I happened to have just finished assisting someone in adding their new VLAN to a switch port, here: Separate subnet on physical port #4
Be sure to read the whole thread and understand how your router's CPU is tagged, and to properly identify the port you want to convert to VLAN 3. Each device running LEDE is different.