Mac Forums

I am planning on putting a tv in my room. I don't currently have a cable cord or port, I am getting an iMac though. I also have wireless internet, but that actually requires a USB key to get. The apple website didn't go into detail about requirements or anything I needed to know. So I was wondering if I needed to install a cable, get another USB key to connect to the internet, I really just need to know exactly what I need to get if I'm starting from nothing. FYI I don't know anything about electronics, so using English instead of hardware jargon would help (: Also, would I be able to use cable tv with channels, AND the apple tv on the same tv? I'm really just confused about what I need.