Hi musicboy,
Let me see if that's possible for me to do that - about the sheet music. About beginning to play by ear, you're kind of like me. I took piano lessons all my life (except I'm much older than you, 23 now), and when I was little I used to naturally pick up songs by ear until my mom noticed I was playing and she put me in piano lessons and they of course teach you not to play by ear. It's a good thing and a bad thing, because you're taught to read very well, but then, your ear is still an infant. I was planning on reading some of these posts on developing your ear, and my uncles who play very well both ways have given me some advice also. Basically, it's going to take time and practice just like it took time and practice to learn to read. But you are very young and have lots of time to develop your ear very well, and I think it's wonderful that you are being involved with your youth choir.
In any case, like I said, if it's possible I'll get that music to you. In the meantime, don't neglect the power of developing your ear. Once you have both talents, you can do anything with music.