My knees are making noises for 30 years now. It sounds as if they were was sand in the joint. It doesn't hurt, the doctor can't find anything.... so what..
Stopping technique, that's easy: Don't stop! Seriously, the more often you race the less need for stopping you are going to have.
Pedaling in general: You can choose a small gear (less forces on your knee), if you are good at spinning (I'm not).
Frankly speaking I don't think that track is worse than road. The stopping is no issue because you will rarely need it. I know in the beginning it feels as if you have to slow down all the time, but that doesn't last long. Go have fun!