Start learning all the major and minor chords. Then study all the white root note major scales, seperate hands should do for now. For a classical approach, start learning some Hanon excersises and perhaps have a look at some of the Czerny for beginners. Then you can venture to simple Bach or Mozart. There are a lot of basic pieces written out there, too many to list, a good rule of thumb is to always learn things that are pleasing to your ears.