Mmk, well if you need help setting up the network, let me know the make and model of the router, what your internet connection is (DSL vs Cable vs Dial-up.... I'm not even sure if you CAN use dialup via a router tbh), and the approximate location of the computers that will be using said router, and I'll write you up a guide to help you get going, if you can't find someone who can do it for you in person.

Also setting up wireless security can be pretty tricky, especially if you use items like the Wii or the DS that are only compatible with specific (shitty) types of security. Actual passwords rarely work, as well, depending on the router, so most of the time you have to rely on memorizing (or writing down) a 16 or 32-bit hexadecimal (0-9,A-F) code.