Playing scales on your guitar is fairly basic once you understand the interval patterns. The Major Scale pattern is W, W, H, W, W, W, H (W= Whole step, H= Half Step), so the notes for a C Major Scale* are C, D, E, F, G, A, B, C. Give it a try and soon you’ll be scaling your guitar! 
Play on…
Marlene

*To learn more about the C Major Scale and hear a detailed description of how to play the scale listen to my newest podcast ~ episode 32!