Went to Carmax, am I getting a good deal?

I took my car to carmax today. I currently have a 2003 Ford Focus with about 126K miles on it.

They appraised it at $1,500 which seems good to me, but I don't know anything about cars.

I want to get a 2012 Fiat 500. I forgot to have him write down all the info, so I can't remember stuff like the interest rate, but I would be paying about $272 per month for 6 years.

The salesman was trying really hard to get me to buy the warranty. I have always heard that car warranty's are a bad idea, but I don't really know why.

Where can I find the usb port on my ford focus?

I just bought a 2012 ford focus s sedan. It has the aux button for the usb port but I can't figure out where the usb port is at or if it has one at all. Also does anyone know if I can install the sync system even though it doesn't come with it?