Just connect the switch to one of the ports on your wireless router (assuming there are ports on the router as in a 4-port wireless router). And then connect the devices to the switch.
For the devices to obtain IP addresses automatically from your ISP's DHCP, the port that is used for the switch needs to be configured as "switching port" to allow multiple IPs to be assigned. If you don't need internet ont he second 2nd network forget what I just say and just assign static IPs to each devices.
You should also assign subnet, gateware and DNS should IPs alone is not enough for the device to talk to one another. ipconfig from the laptop should give you all the details you need.