Note Duration, Measures and Time Signature

OK, so today I'm going to send you over to the music theory site and have you look at the two of the lessons. They are animated and really short, and you'll have a good understanding of how rhythm is notated.

http://www.musictheory.net/lessons/html/id11_en.html

http://www.musictheory.net/lessons/html/id12_en.html

When you're done with that, come back and I'll talk about intervals.