There will be an instruction booklet that includes lots of photographs. It will probably be printed in color. There will be a quick start section that will show some combinations that make beautiful patterns quickly. More complicated patterns will have instructions and photos as well but not every combination can be covered in the booklet.
There are many small parts and the knurled nuts need to be tightened in order for the gears to not slip. It will be a great project for a child to do with an adult but probably not on their own. I think many kids will love to see the patterns develop and they'll have loads of fun turning the crank. But it will be more fun with an adult around.