A few questions about xbox live on 360?

Im getting xbl gold for my birthday and im in need of a lil help. 1) when i register it using my profile, can both me and my brother have individual gamertags ect or does he have to use mine? 2) do i have to buy another card from my local game store to top it up when the year has passed, or can it be registered to a credit card like on the original xbox. 3) is the official 360 wireless router thing (the little one that costs around £60) actually worth the money. im no nice with proper routers and ive heard this one is incredibly simple to set up. thanks to you who answer.
Answer
1) if he wishes to play online on his own account, then he will need to buy his own account. although, registering his in the first place will get him a free month of gold. (you could then feasibly keep making new accounts for him to receive more free months under different gamertags). also, they are having three days of free gold membership later this month as a taster for those on silver accounts. 2) you can use a credit card immediately to pay for a year, or small increments. you can also use this credit card to buy microsoft points to download arcade titles. 3) the official 360 wireless router is a brilliant piece of kit and incredibly easy to set up. works like a charm.