To make a book, place 3 papers and 1 leather in the 3x3 crafting grid. When making a book, it is important that the papers and leather are placed in the exact.
To craft a hopper, you'll need a chest, and five iron ingots. Using a crafting bench, put the chest in the middle, and arrange the ingots in a v-shape around.
Make 4 2X2 platforms in green wool. For the first 2 have 4 blocks in between them. Then have the next 2 parallel with the other 2 but 4 blocks between them.