Understanding the Mary El

Does anyone who reads the Mary El - using and understanding all/most of the esoteric symbols and layers - have a recommendation on where to start deciphering it all? Marie White provides a decent bibliography in the back of the guidebook but I expect some positions are more illuminating than others. Like probably the selected poems of Rumi won't give me as much as "The Chemical Wedding" by Bruce Dickinson. Maybe you have your own suggestions for the most impactful book or area of study to start with? It doesn't have to be from her list.

(Sorry, if there was a previous thread like this I couldn't find it, mods feel free to move this?)