A scale is a series of tones. The tone, the scale is built from and named after, is called the root. The different scales is characterized by the distance between each scale tone - a half tone (½), or a whole note (1).
A major scale consists of seven different tones in the structure 1-1-½-1-1-1-½. The distance is the same, regardless of the root.
An important characteristic of the major scale is the major third on the 3rd step (that characterize major) and the diminished seventh on the 7th step (there are lead tone to the root).
The first scale you need to learn is the C major scale. It is only using the white keys. Below you see the scale within one octave with both hands.
The next scale you are going to learn is the G major scale. It uses the same fingering as the C major scale in both hands. Notice the # in the beginning of both staves. It tells you that the key is G major. In G major there is a # in front of all F notes, so they become F#.
Finally you are going to learn the F major scale. The fingering in your left hand is the same as C- and G major, but it is different in your right hand. Notice the b in the beginning of both clefs. It tells you the key is F major. In F major there is an b in front of all Btones so they become a Bb