I'd like to get some sunglasses..?

Any eyeglass shop can make prescription sunglasses for you. I recommend a full coverage lens (rayban aviators are always good) instead of the square because you'll be flying and light can reflect off of the instruments. Not sure about that brand of aviators you selected. You can't really wear sunglasses over glasses unless they're the flip downs or elderly covers; you can use those but they look really dumb and don't work as well as regular sunglasses.