In general, a good test for thickness is that you should be able to see your hand through the dough if you carefully lift it up.
To roll out your pasta by hand, shape one wedge into a oval-shaped flat disc, as directed above. Transfer the disc to a cutting board, and use a rolling pin to roll out the dough until it reaches your desired level of thickness (generally between 1-2 mm thick), adding extra flour to the cutting board as needed to prevent sticking. In general, a good test for thickness is that you should be able to see your hand through the dough if you carefully lift it up.