Varies. Some pts develop their tics gradually over many months. Others get tics suddenly. Sudden onset of tics suggests panda's (see my health tips). Most often a single muscle group or area tics. Then they may change to another. In severe cases multiple muscle groups get recruited in the tic. Finally, vocalizations may occur in a similar manner - from simple to complex and intrusive.
Tics. Early symptoms in youngsters are usually clearing of throat sounds, and sometimes blinking of eyes.