Make sure you know how to ride a bike safely. If it is your first time riding, consider lowering the seat so that you can put most of your feet on the ground while seated. You should also check the tire pressure, brakes, and such. If you’re wearing long jeans or other long pants, be sure to roll up the right pant leg so it doesn’t get caught in the mechanisms on the right side of the bike. Avoid long skirts or baggy clothing (which could become caught in the gears or tires) and flimsy or open-toed shoes (which might prevent you from stopping yourself effectively should you opt not to use the brakes).
Riding on the sidewalk is inappropriate or illegal or dangerous in some areas, particularly urban areas because you might hit people.