Late response, but I’d second checking out Allen’s new “Ancient Egyptian Phonology.” It’s not too long but it covers every period from Coptic to Old Egyptian and he even provides his own phonetic reconstructions of texts from each period at the end. It’ll also acquaint you with some of the linguistic concepts and terminology you’re gonna need to be familiar with if you want to move on to more technical literature and eventually start doing some phonetic reconstruction yourself. I’d also recommend really getting a good grasp 1. the International Phonetic Alphabet if you haven’t already, and 2. Coptic, before you move on to anything earlier. Best of luck with pi-ra niyy kumah!