If you want to set up your own network, and you have multiple computers, you will need to set up a router. Cable (wired) routers, while still legitimate, are quickly becoming obsolete so this article focuses on wireless routers. Most retail wireless routers will cover a large area in your home or office. However, to cut down on cable usage, you may want to place the router as close to your modem as possible. Your modem will have a phone line connection so it will be less mobile. Ideally, you would want your modem and router to be one device. Many ISPs will give you a modem/router but you'll have to request it. Wireless routers have built-in installation software that you connect with and use via an internet browser. You don't need an internet connection to configure your wireless router. In fact, you can setup a network without an internet connection at all.