Afro-Asiatic

Hello,



Could someone give me more information about the first emigration wave of
the Afro-Asiatic languages. I thought that they came from Arabia, but I
always heard that Egyptians came from the south to Egypt by following the
Nile. Could you give me the exact emigration and give me some websites were
I can find information about the emigration of the Afro-Asiatic languages.


Thanks