I did the hard part for you and included some Megalodon resources that you could use for your research paper.
This site has information about Megalodon's size and what he ate.
This site has lots of information about Megalodon, so every group could most likely use it.
This site has a little information about Megalodon's world.
This is a lengthy article about Megalodon, but it has some good information in it.