|You can configure your wireless network card in the normal way.|
If you want to use internet over the wireless network card, you have to configure default gateway at the wireless card not at the lan card.
This is, because the lan card can see all computers and devices, connected to it without any entry for the default gateway.
The default gateway is used only, when you try to access an ip address or a domain, e.g. googl.com, that is not found locally.
So in that case, when you've configured the ip address of your wireless router as the default gateway, all the internet traffic gets routed to your router and from there to your ISP.
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