hi mate, ive made my xbox wireless just like you except my gear is all D-Link!
i did this over 2 years ago so bear with me mate lol!
ok, what you need to is first plug the netgear bridge in to your pc and see what firmware its using and if theres an update. if there is go ahead and do it, mines had stock firmware which didnt support xbox live or anything until i upgraded.
setup your wireless network SSID and set a low level encryption to mkae sure the bridge supports this unless you know for sure what it supports, set the wireless network on the router. once done.
swtch on your xbox with the netgear bridge plugged in and go in to the network settings in the xbox main menu and you see settings for wireless if you go in to advance all you need to do if find the wireless network SSID, once u select it, it should retreive the key automaticall. thats what mines did! if it doesnt enter in manually!
once done reboot your xbox ans swtich back on go back into network settings to make sure its connected and check the signal strength.
depending on your router you may need to give the xbox a static IP.
hope thats helped you out abit, anymore questions let me know.