Will I receive feedback from the TV station on how well our commercial is doing?

For example, will I receive information on how long people stayed on the commercial or how many viewings we had, etc.

To the best of my knowledge, neither over the air TV stations or cable stations have a way of doing this. The best way to track the effectiveness of your commercial is to create a method yourself – such as having people go to a specific website, call a specific phone number, respond to a specific offer that is unique to the TV ad, or track sales in a specific test market during a test run of the ad in that market.