Congratz on the purchase.
1. there should be a dail near the steering wheel... the dimmer was needed for compliance, so it wouldnt look to flush with the car
2.thats correct..only the passenger should lock. when you manually lock the driver side, that will lock all doors
3.i have a 4dr so im not sure, but that should be right
4. that will be the XENON headlight adjustment. if you select the setting one by one, the low beam light moves up or down and adjusts accordingly. thats why they had to take the xenons out from compliance and put normal bulbs in. cause we have to manually adjust the angle of the low beam. i think european cars like BMW have it auto adjustment . it is just so you wont blind oncoming traffic when your going up/down a hill
5.well when your on tiptronic mode, you push the switch and you should see a display on your cluster of a steering wheel that means you can change gears on the steering wheel...which has a + and - so you can gear up/down.