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I can setup the router IP, I can setup the subnetmask.... but where do I setup the subnet itself?? Or again, will it simply follow the subnet I choose with the router's IP?

When you set the router's LAN-side IP address and netmask, you define the subnet. There is no need to specify the network manually; it's trivially inferable. For verification, go to "Diagnostics->Routing Table" and you'll see your subnet.

On the other hand, it looks like the router requires that you manually configure the subnet or subnets of the remote LAN into the VPN rules. It's under "VPN and Remote Access->LAN to LAN->4. TCP/IP Network Settings->Remote Network IP and Remote Network Mask".
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Bitt Faulk