I can highly recommend having a folder for each subject (a big sturdy ring binder). Also those coloured tab things that separate each section and lots of the clear plastic wallets. Obviously pens, pencil, ruler, coloured pencils, pencil case and paper (lined with a margin). Get a little notebook/diary that you can keep a record of homework/hand in dates as well. Scissors and glue can come in handy occassionally. If you're studying a subject involving maths a calculator. You may also need some graph paper but I wouldn't get this until youy know you'll need it. Anything else you can probably get as and when you know you need it (e.g. text books or subject specific things).