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RE: Wireless network/Newbie questions
1) You can do that manually via the router's web interface; the wireless access point can be disabled when you're not using it. If security is your concern, there are multiple mechanisms you can configure to prevent unauthorized access, including MAC address based filtering. The access point also automatically adjusts its transmitting power based on the number and position of connected devices.
2) For the cabled devices no. Wireless devices will be limited to the access rate of the wireless standard used (also by half duplex).
3) Although it can't compare to a full featured stateful firewall solution, the router will keep your network behind a NAT, adding a layer of security.
4) No, you usually don't have to change anything. However, some applications will require the use of the port forwarding mechanism on the router to be able to listen to incoming connections.
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