I was sooooooo scared of sheet music, and for the longest time, I avoided it--it looks very intimidating! But, when I decided to take up ocarina, I figured that I might as well give it a shot. I was SO SURPRISED with how simple it really is!
Here are some links to get you started:
Teoría - A music theory website with great tutorials and exercises.
Ricci Adams' MusicTheory.net - Interactive lessons and exercises.
STL Ocarina's Fingering chart and composer - Here you can see how fingerings on your ocarina relate to the keys on a piano and the notes on the staff.
Metronomeonline.com - A free online metronome.
In addition to utilizing those websites, I made flash cards,
and I would also paste tab blanks on sheet music, and then fill out the correct fingerings under each note.
If you have found a piece of music you would like to do this with, then let me know, and I'd be happy to put tab blanks on it for you.
It is best if you can have your ocarina nearby when you are studying these things, as you will be able to pick it up and feel the proper fingerings, hear the note that goes along with it, and see the corresponding note on the staff. When that is entirely impractical (in your car, in class, at work, out to dinner, etc.), then you can bring your flash cards and go over those! Hopefully, by using all of these things at different times, you will learn to read music in no time at all! I think you will impress yourself with how quickly you can get the hang of it.
Good luck! :D