The cutting board is a clean and thick surface intended to cut safely, using your knife on your work surface.
If you need to buy cutting boards: get a large one, not less than 30×40 cm. or 12×15 inches, made of food quality plastic.
If you prefer a wooden cutting board, just pay attention to the level of hygiene as a wooden cutting board is nearly impossible to clean completely, so germs develop on them by the time. Although they look great and stylish, know that when you use your cutting board with a sharp knife you end up making sawdust that go into food.