To make a corn roll you have a couple of options rolling the hair like a french braid taking one piece of hair and rolling it around the other then keep picking up hair as you go. OR below shows taking the section of hair and pulling it out straight then start rolling in one direction this also makes a roll in the hair.
I don't have a good picture of this but to make the flower. Take a small amount of hair and put a lose twist in it. Hold it in a loop until all the strands of hair have a loop. Then put an elastic around the base of the hair you are holding.