The modem connects to the cable, the router connects to the modem, all of your computers connect to the router. It sounds like you already have everything that you need. If you have a wireless router it probably has a password protecting the wifi from unauthorized users, so you would have to enter that password into your laptop. There should be an item on the start menu tray that tells you if you are connected to the wifi or if your computer detects the wifi. Go through that, tell it to search for wifi connections, pick the one that belongs to you, tell it to connect, enter the password, and that should be all that it takes. If you have difficulty with this you could try connecting directly from the computer to the router with a network cable. If this works then you should be able to reach the network with wifi.