Fill an a4 sketchbook. How?

Ive just finished my foundation in art, i didnt do A level art either i didnt even do gcse art, i had no idea at all what i was doing bumbled through all of it and i ped, so you'll be ok. The answers above are very useful. My tips i can add for getting through any project is - basically, buy the smallest sketchbook you can get away with! (usually A5) and dont buy something huge like 100 pages, buy a 50 pager. And fill it with any crap you can think of, just anything romotly ociated with chairs, wooden chairs, trees, plastic, ikea, colours, 1950s chairs, 1700's chairs, stone age chairs, anything that takes your fancy, draw them, stick pictures in, ramble on why your drawing them, if you dont know why make it up. And when you're about halfway through start drawing your own designs, write some pages on other artists (type Chair Art in google and you'll find some) and say your inspired by them even if your not, find some way to put a something similar to theirs in your designs. Tutors never like if when you pluck an idea from nowhere, they always like seeing what artists inspired you, i know its stupid because sometimes it really does just come from nowhere but they just want to see you've done your research