At this point, I don't see much purpose in trying to ask a professional a good research question before I even know what I want to do with my paper. And I need to actually have something on the page before I begin doing any serious research -- I have precious little time as it is to finish the essay, and I don't want to waste it panicking and chasing down references, quotes and essays which I will not end up using when what I most need to do is just write something.
While I've done a close reading of The Phantom Tollbooth, armed with my red pen, I've found quite a few topics that really interest me. My current course of action is to let the words flow out, putting my ideas down to the paper. I've loved finding puns, new perspectives, and repeated themes. I feel like there is a paper floating around in my mind, even though I don't know the thesis yet. I'll write the paper, then see the thesis spell itself out in the words.