The Haydn D major is a magnificent concerto to start with, and it's also well received when performed. it was my first. or start the Schumann concerto. It's fairly easy and will require minimal amount of work. also The Mozart Concerto no. 12, 14, 19, 21, or 23. the better out of the Chopin I'd have to say would be the F minor it's not very difficult and it's an amazingly beautiful piece, my teacher was in the front row weeping when I played the second movement all 6 times I performed it; I dunno if it was for a good reason or for a bad reason. It's still a really beautiful piece and very playable