In the first half, write your own (original) creation narrative, which can focus on  cosmogony (creation of the cosmos), theogony (creation and succession of gods), or  anthropogony (creation of humans), or all of the above. Your narrative has to be original:  it can contain elements that are present in ancient stories but cannot be a copy of any one  of them. You can write it in the form of a prose narrative or in verse or as a song,  however you choose.