A lot of people change to a synthetic oil, like Royal Purple, Mobil 1 and Amsoil. This can extend the interval between changes to ~ 10k miles or more under the right conditions.
Personally, I use Royal purple and go ~ 9k miles with a filter change at ~ 4.5k miles. I could probably go a bit longer but I'm a spirited driver, so I change sooner.
Here's what Royal Purple has to say about synthetic oil change intervals.
Premium Full Synthetic Motor Oil Change Interval
I have 28k miles on my '06 and haven't changed brake pads yet and last I looked, they still have plenty of pad left. Just check them from time to time looking through your wheel spokes, you should be able to tell if they're worn to the point of being replaced.
Congrats and good luck with your new Stang!