2005 X Type Questions

[pnyklr]

1) whats the S thing that is lit up next to my automatic shifter

2) what are the headlight/fog light combinations I can get up to three lights to light up on the dash but have no idea what they mean

3) I have an airbag sensor light on how do I get that checked

4) how ridiculous is it to bring the car to the dealer for service and what do they do at different mileage intervals and whats an idea of price