Don't understand WG602v4 Client Mode

I'm trying to use the WG602v4's Client Mode, and I'm confused. Here's what I'm trying to do:
I'm working in a factory that has a wireless network, with DHCP, using WPA-PSK security, and has internet access. I need to set up a small wired network of a few devices that don't have wireless capability. The devices need to be able to see the internet, and I need to be able to make connections to them from the internet (I know I will have to set up some firewall rules to enable these incoming connections, but I haven't got that far yet). I have therefore connected the devices via a hub to a WG602v4, and tried to configure it to Client Mode. I have enabled DHCP client, and disabled MAC Cloning (which I don't understand).

I can connect to the WG602 via the wired network using its default IP of 192.168.0.227. I can see in the Information window that it is associated with an access point on the factory WiFi network. But I can't connect to anything on the internet via the wired network and the WG602.

Having set up this client mode device, I don't understand:
- is the wired network now part of the factory network? The factory network has addresses like 192.168.11.x (mask 255.255.255.0). The WG602 (at least on the wired side) has addresses like 192.168.0.x).
- do devices on the wired network have to have addresses on the 192.168.0.x or the 192.168.11.x subnets?
- if I have devices on the wired network set to DHCP, do they get their address from the factory's DHCP server, or from the WG602?
- If the WG602, how do I set it up as a DHCP server on the wired side (as well as a DHCP client on the wireless side)?
- if the wired segment is a different network, can I choose which IP address range it uses? How?
- if I want to have the wired segment as a different network, with its own DHCP server, IP range etc., can I do this with the WG602? How?
- if not, what other device do I need that will do this?

Thanks - Rowan