
Sarah!
I highly recommend the book "A Walk Through The Southern Sky"- A Guide to Stars and Constellations and their Legends, by Milton D. Heifetz and Wil Tirion. The price varies considerably on this book; Angus & Robertson sell for $33, Borders $60, Booktopia $27.
Here is the link for Booktopia, you also get to preview the book here
http://www.booktopia.com.au/search.e...&submit=search
I also recommend a Planisphere.
Fantastic to see young enthusiasm in Astronomy. Do you own binoculars? I agree with Duncan, on a pair of 10 x 50 binos, even a 7x50 which a lot of us own will see you through very nicely.
For the future of Austronomy, We will be relying on your generation to give us more answers of what we so desperately seek to know. With your enthusiasm combined with the fact that you know exactly what you want to do while you're in high school, you are a prime canditate for that reality.