Myths, scriptures, treatises: what do we have that was written down?
The New Kingdom period of Ancient Egypt is well documented at the temple of Amun-Re in what is commonly known as Karnak. This web-site gives you an over-view of this temple complex.
http://dlib.etc.ucla.edu/projects/Karnak
I found James Henry Breasted to be helpful, in a pre-internet world. The founder of the Oriental Institute of the University of Chicago, Breasted was one of the better Egyptologists of the early twentieth century. His 1906 book "Ancient Records of Egypt: Historical Documents from the Earliest Times to the Persian Conquest. Collected, edited and translated with commentary." He can identify exactly where in Karnak are the actual historical inscriptions of more than thirty Egyptian pharaohs. In the 108 years since this book was published, more information has come to light for other periods of Egyptian history, but for the earlier parts of the New Kingdom, Breasted work still holds up.