有關Wireless Lan/WiFI/router/hubs/switch問題

我部電腦是用和記寬頻10M(有個modem個隻)上網，
最近買了一部Notebook，在家中上網時非上唔方便，時常要拔線同插線(lan cable)，
又要同屋企人爭住用，因為不能同時一齊上網，在網上看到有很多方法可以解决我的問題(例如買routers/hubs/switch)，但不知那種最便宜，請各Brothers指點，
如果我想，兩部電腦同時上網:

1. 如果我唔介意notebook都駁住條Lan cable，咁要買乜?記多錢?
2. 我部notebook有wifi (唔知係米即是wirelss lan card?)，唔想駁住條Lan cable，咁又要買乜?記多錢(但係要房同聽都上到網)?部desktop又駛唔駛加野?
3. notebook 用 desktop 都一齊用wireless lan上網，咁又要買乜?記多錢?
4. lastly what's the difference btw switch and router?

請願量我這個電腦新手的無知問題

電腦新手

1. a simple router, can be from HK$300+
2. a wireless router, HK$400+
3. a wireless router, and an USB wireless station for the PC. HK$600+
4. please read some books, hard to explain here in full. Switch is basically forwarding the ethernet information to the correct IP address and doing no more. Router is more intelligent allowing "rules" and even reading the contents inside the ethernet packets. Therefore router can talk to the internet with one IP and talk to other devices on the LAN with other different IP's, hence called NAT network address translation, which is the basic of firewall and network security. You will need a router for connecting multiple devices into your ISP (internet service provider) since most ISP will only assign you with one IP. The router will take up this IP and talk to the ISP (real-IP) and talk to your LAN devices with internal IP (ie 192.168.x.x).

thank you. learn a lot