It all depends a little on your skill level and what works for you. Firstly you need to put the camera on servo focus (to make sure moving stay in focus) and set the camera to motordrive. As mentioned above around 1/320 to 1/500 is a save speed. I would strongly recommend speeding up and slowing down throughout the day, so you can get a better idea of what works for you and what doesn't. With a little practice you should get the hang of it.
If you should see a man walking down a crowded street talking aloud to himself, don't run in the opposite direction, but run towards him, because he's a poet. You have nothing to fear from the poet - but the truth.
(Ted Joans)