Beginners should practice these scales regularly. Make sure to repeat each scale (at least 2x) when you get faster.
The symbols on the first bar are down, up, down, up etc (this continuous pattern is called Alternate Picking), to be played with a guitar pick if you are using one. See below key for which one is which. Make sure to do this for every scale. At first though, you can just do all down picks to make it easier if you prefer.