You need to get your basics down first and then move on to more difficult work. (maybe you already have done this)
I learned mine years ago through Wilton books and then practice. Now I'm trying harder things like some of the British cakes have on them and the Sugarcraft series of books - 1, 2, &3 are very good. Toba Garrett has good piping in her books and of course there is the holy grail- The Lambeth books from the 1930's and the reprints from the 80's. I'm waiting for my copy of the 30's edition and hope it's worth the beaucoup bucks I paid for it. I hear it is. And then I'm just going to pipe my little heart out and practice practice practice.
I'm sure someone else here has better suggestions for you.