The way I did it is buy a notepad like a pukka pad which has dividers built in, so you can take notes in a different section of the notebook for each subject. I bought a plastic wallet and put any relevant sheets and things in there all together so they were easy to find and take with me, and cleared it out into proper display folders every so often so nothing was lost and I wasn't carrying a years worth of sheets.. You could always rip out the notes from each section and put them in a folder if you find that easier too. Everytime you finish a topic, transfer the notes into a display folder to keep at home so you have them all safe, but if you don't need them at college you don't need to carry them round.
For what to buy, it's personal preference because I personally hate ringbinders, but i'd get a folder or two for each subject, either a ringbinder or a display folder with plastic wallets in (these are what I prefer). I'd get a few of those plastic envelopes to carry sheets in and I'd get at least 2 notebooks with dividers. As well as pens pencils calculator, ruler highlighter and rubber and sharpener all in a clear pencil case. You don't need to go over the top, buy things as you need.
In my first year I found that my method of organisation really wasn't working for me and changed it up a few times so just see what works for you!