Engage your brain before you start your feet by getting instruction on controlling speed, turning, braking and stopping.
Cars pose a deadly threat to skaters. Never skate in traffic, and it's not a good idea to skate at night.
Roll on a smooth, paved surface, watching out for water, oil, gravel, marbles, banana peels, kids and other hazards.
Sure it's cool to skate with headphones, but you won't be able to hear the anguished cry of Mr. Bicycle Racer coming round a corner and bearing down on you. Likewise, don't wear anything that obstructs your vision.