Any recommendations for an EA? I will be initiated next Friday and want to have some books prepared
That truly all depends upon if you enjoy receiving gifts not knowing what they are OR knowing what they are in advance.
Reading anything about ritual before hand that spoils a surprise defeats the whole purpose of experiencing something for the first time without foreknowledge.
That being said and to the contrary, if you have seriously studied the Bible (more specifically what is called "The OT" by Christians) and Classic Greek Philosophy, you're going to experience Ritual as a kid in a candy store with free reign. If you have not done so, then you're going to be pretty well impervious to most all that is put before you, including the explanations.
Either way, I suggest you go into this as if it were a rollercoaster ride and do so with your hands held high and your seatbelt fastened tightly; enjoy the ride!