ah! can someone tell me what note to start on, and which notes are sharps?

Are you sure you are talking about the G concert scale and not your G scale? If so, then I would have to know what kind of sax you play.

If you play an Eb sax (alto and bari), then that would be the scale of E major for you. Start with E. This scale has four sharps, they are: F#, C#, G#, and D#. (The scale is: E, F#, G#, A, B, C#, D#, E).

If you play a Bb sax (soprano and tenor), then that would be the scale of A major rour you. Start with A. This scale has three sharps, they are: F#, C#, and G#. (The scale is: A, B, C#, D, E, F#, G#).

If you are talking about you G scale, then start with G. This scale only has one sharp (F#). The scale is: G, A, B, C, D, E, F#, G.