Slice off a piece of the dough. The size doesn't matter as long as it's not too big. With a little flour on the worktop, start rolling the piece of dough into a long, rope shape. Keep the rest of the dough covered. If you have too much flour on the counter, you'll end up not being able to roll the dough. It's a learn as you go lesson. Roll it so that it's about ¾" (2 cm) in diameter.
Cut the rope of dough into pieces which are about ¾" (2 cm) each, a little longer is okay, but don't make them shorter than this.
Once the length of dough is cut into pieces, start rolling the gnocchi on a fork or gnocchi board to give them ridges. The ridges will catch the sauce, and I just think gnocchi without ridges are like zebras without stripes!
Be sure to use enough flour so that the gnocchi don't stick, and roll them down the front of the fork tines using your index and middle finger to push on the dough, while holding the fork at a 45 degree angle. Do the same if you are using a gnocchi board. Be sure to flour the board before beginning. Continue to cut off pieces of dough and repeat until all the dough is used.
Gently place the rolled gnocchi on a counter or tray that's lightly dusted with flour, or even better, a fine semolina. Also, try not to let the gnocchi touch each other as this will keep them from sticking together. You'll want to boil the gnocchi sooner than later as if left too long, they can get sticky.