hmmm...a lot of things. i mean, it's a pretty big project. but this site will probably help.
http://hsc.csu.edu.au/agriculture/project/project_writing/project_writing.htm
my teacher gave us heaps of other handouts for it, but i don't know where he got the from. but basically you should use should site sources all the time, even outside of your review of litereature, like in your intro, synopsis, etc. make sure you choose a good topic, if you haven't already. i did the effect of differing protein levels on japanese quail. if you're interested i can send my project to you to have a look at. biometric analysis is a must (get your maths teacher to help you with that)...and just try and make it kind of lengthy (around 30 pages), but still really scientific. um, that's about all i can think of, but if you have any more specific kind of questions, just ask.
oh, and get started really early, like now. because the final draft is submitted around trials, and it's a bitch to have exams AND this to worry about. i'd recomend devoting about two to three hours on the weekend getting the write up and the experiment all organised, and then starting if you haven't already.
is this the first time hurlstone has allowed kids to do the research project? because i was talking to a friend there and she said that you guys didn't do it this year, you did the three hour exam. are you a boarder?