Starting at G, go a W-step up, and the next note will be an A.

Another W-step will give the note B, a H-step will give the note C.

The G scale, using the same intervals as the C scale, written down, would read as fellow's;

G W-step A W-step B H-step C W-step D W-step E W-step F# H-step G .

The notes to these scales are written down on the numbers chart so you have the answers in front of you if you would like to do more scales so you understand.

Take a pencil and using the intervals explained for the diatonic scale, work out the rest of the scales.

I realize that working these examples can be boring, but you only have to learn it once and then the hard part is over.

Whenever you reach the F scale, you may wonder "why does it have a Bb character and all the rest of the scales have # or sharp characters?

This is a matter of logical sequence. (A,B,C's).

Look at it this way.

Which one reads better;
F, G, A, A#, B, C, D, E, F

or

F, G, A, Bb, C, D, E, F

The last one does to me, how about you?