Reddit mentions of Ancient Egyptian Literature, Volume I: The Old and Middle Kingdoms

Manetho should be taken with a massive grain of salt. In many ways we now know more about the lineage of kings than he did.

This book, in three volumes, will give you an excellent (and accessible) translation of some of Egypt's most prominent ancient writers

Notables include: Ptah-hotep, whose maxims are excellent sets of guidelines for how to live a wise and honorable life. Also of note are Akhenaten, whose Hymn to the Aten is one of the great religious texts.
Then there's the countless love poems, personal declarations and the religious texts. Most of these can be found in the various volumes of the above book.