Sounds like you're getting your first pre-molars removed. I had the same of mine removed about three or four weeks ago, followed by braces about ten days ago.
I ate a lot of soup, mashed bananas, pudding, yogurt, and ice cream those first couple of days (soft food guides on the main forum page are also useful). I suspect if I hadn't developed dry sockets in two of the extraction sites, I would have graduated to big kid food much more quickly. If memory serves, I was eating regular food (salads, roasted vegetables, fish, chowder, apples!, etc.) four to six days afterward, even with the medicated gauze used to treat the dry sockets. I did try to avoid excessively pointy food and anything that required biting in to it. Also, cutting your food up in to small pieces reduces the amount of work you have to do post-mouth entry. Be prepared for entire meals to get stuck in your crevasses though.
I think which teeth get moved depend on how your teeth and jaw are currently positioned and what the final goal is. My ortho told me that he wanted to keep my upper molars from moving forward, but yours will probably be different. I'm sure you could ask about it.
Anyway, good luck!
