How to reset service reminder?

I'm a first time BMW owner. We just got a 97 528 with 110 k miles. I got
it for $9,500 and it looks very sharp, runs and drives very well and we
quickly discovered the appeal of driving a BMW. We knew when we bought it
that there were a few things needing fixed; 1 window window regulator,
climate control display, remote trunk release.... There are a couple of
guys in the area who specialize in working / restoring BMW's. The repairs
we need to make will cost about $1,250 plus it's going to need tires soon.
Do you think I got a reasonable deal?

After having the BMW dealer price a 4 wheel alignment at $181, then finding
that a local tire store could do a good job for $49 I'm betting that there
are very few reasons I would ever take my 97 528 with 111,000 k miles to the
dealer. A guy at work said an installed battery would cost about $300. I
found a BMW site which tells what type brand of $100 Diehard fits and works
fine. Are these kind of price at the dealerships normal?

Usually I change the oil in our cars myself. On the BMW there are the
"service lights" on the dash that come on and tell you how long till ervice
is needed. Does anyone know how to reset that yourself?