Ok this is going to be a long response to everyone that has helped so far. Keep adding what you use or have used when you were at school and share it with the rest of us!
I love pilot ones too! And Uniball pens are pretty awesome as well! 
I don't use an exercise book for english, a notebook has it all (and some looseleaf paper). One 120Pg notebook (without perforated lines) and two 128Pg exercise books for Methods. The same for spesh.
I will most likely get some pilot pens since many are recommending them. I probably won't go for getting that many books for methods as I don't want to have to go through 3 different books when looking for a question or information.
accounting i didnt really need much as we had a textbook and workbook combo thing.
but i also have a 120 page book which i used to write theory and things to remember for each chapter.
stationary just the usual for all your subjects
but i do suggest go to the newsagents and get a really good pen, maybe 2 or 3 at $8-10 that is comfortable, easy to write with and fast and use it for sacs and exams
I might get a 2 section book for accounting but only 120 pages. One part for any information and maybe some notes from the board, and then the other section for my own written notes for each chapter. Would you say that's a good idea?
I will most probably invest in a couple of good quality pens to use for sacs and exams.
When the supermarkets go on sale just grab as many books as you can. They will usually only cost around 5c per book because if the discount. But go early like day one or two of the sale cause they run out quick.
Hahaha I love buying those really cheap books, can't wait for those sales to arrive!
I feel helpful so here is my gear 
In terms of what's in my pencil case so far..
- Ti nSpire CX CAS
- Casio FX-82
- 3 BIC Round Stic (Red,Black,Blue)
- Wooden Ruler
- Eraser
- Sticky Notes
As for Excercise books. From Left to Right. Methods - Further - Chem - English
English has 5 Tabs
Tab 1 Growing Up Asian (Context)
Tab 2 Language Analysis
Tab 3 A Christmas Carol (TR)
Tab 4 Cosi (TR)
Tab 5 Skin (Context)
Aside from this, I have 2 bound reference books for Methods and Further. These double as my summary and recap notes too.
Business Management will be done fully electronically.
I'll be using my iPad for textbooks as well if I need to.
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Hope this gives you some help, and doesn't confuse you haha. 
Haha awesome response, luckily I didn't get confused!

I only have a small pencil case so I only keep in it:
1. 3 paper mate profile pens (2 blue, one black)
2. One red pen
3. A small 15cm ruler. Will be upgrading this in the coming January sales.
4. My Casio calculator. I also have a ti nspire Cas calculator but only bring that when I will have methods and spesh.
5. Liquid paper, the pen one with actual liquid. Note: should I replace this with the paper version? Hopefully you know what I mean.
6. I had a really good rubber this year and had it since year 9 but unfortunately it was almost used up, so I will be replacing it ai a new one.
7. I have my glasses case in there, but will most likely take it out now, since I have to wear my glasses full time now

8. A yellow highlighter. Will most probably add a couple more different colored highlighters.
9. ANYTHING ELSE YOU GUYS WOULD SUGGEST I PUT IN MY PENCIL CASE!!
I will most likely put in some sticky notes and also those little post it note flags which you can use to put on pages you want to look back at.
Would you suggest to me getting a bigger pencil case, or should I just continue using my small one. Size wise, it is maybe 15-18 cm long and 8-12 cm wide.
So for you exercise books what will you be writing in there? Personally I think that 120 pages for your subjects is way too little unless these books are only for a term or semester. In which case, it is fine.
Would you recommend using Derrick ha's book as a bound reference or make my own?
Lol, I'm too scared to bring my iPad to school. I might just bring my textbooks to and from school, or just leave them at home and share at school lol.
And also, that's a good way of separating my English book. I might just do that instead of doing it per term. And maybe at the back of each section I should make my own notes about each book and anything that will help me in the exam for each text.
Cheers kesh

Kesh, just a few suggestions - why don't you get a few spare pens, pencils (to go with your rubber), whiteout (if you use it) or highlighters (erasable ones?)?
Or a few different coloured pens? Such as: I use red for very important notes and headings, purple for subheadings, green/black for sub subheadings, blue for normal notes and pink/orange/light green/light blue/yellow when I want to make things colourful.
Or maybe scissors, a glue-stick, a stapler, sticky-tape, paperclips...
There's a erasable highlighter!?!?!
Scissors, glue etc aren't really useful unless you are an arts student. But if you want they aren't such a bad idea.
I actually bought a bag of about 20 pens I think. Already had a few stolen haha glad I did. I forgot to put my pencil in there, but as a rule, I never use pencil If I make a mistake, I always cross it out. The rubber is there just in case, for random things that might happen. Like surveys and stuff
. White out, pretty much same as above. I'll buy some highlighters, good idea
, will be useful for english and my notes.
I recommend always using a pencil for any maths subject and therefore always having a rubber with you. You'll just be wasting more paper by crossing it out.