Do u know how chords are constructed? if so u will know that a major chord is made of the 1st 3rd and 5th so in Cmaj the notes are C,E,G and the Cmajor scale is C,D,E,F,G,A,B,(C octave) so all u have to do is learn the major scale first.. the Cmajor scale is easiest cause it has no sharps (#) or flats(b) so get that down..then start learning minor scales and so on.. then its just a question of learning how to improvise and come up with solos for your songs and listen to other artists and see how they construct their solos..