No, you can connect your computer directly to the modem (you need a lan cable for that) if you have one.
Wifi router does not require internet to function properly, but if you want to have wireless internet you need an internet provider.
Your LAN will need a router and a definition of the default gateway pointing to that router. The router will need an internet connection as well.
a router
You need a wireless internet router near you to get the internet.
you need a wireless router
An internet connection, and a wireless router.
If your router does not have wireless capabilities, you will need to add a bridge to get internet.
You need to purchase internet service package from one of providers, for instance, Road runner. After they showed up and installed a modem. You need to have a wireless router. Use a lan cable which comes with almost wireless router to connect the modem and the router. When you connect the cable in the router you have to choose a proper port. Usually it's written on router where the internet port is. You need to connect the cable in the router internet port. After that you might have to configure the router.
Yes, but you need an ISP.
Yes, you do.
To get on the internet you need to buy an internet connection. You must plug your internet cable into a router. Then you must have connection to the router, most computers will automatically connect to the internet if the hardware is in place.