Aziraphale is new, so he's going to focus on learning the lay of the land and trying not to get lost. So exploration, but more like...exploration of a map of the known areas.

He's also going to be particularly focused on Sundering and Glyphics, especially as glyphics might be applied to a summoning circle to prevent...uh, the unintended visitor from leaving the circle. He may try picking Professor Drom's brain on this subject, as well as investigating any advances made into the study of bringing/returning sunderings.