Evaluation...
When looking at schools you really want to do some serious evaluation. I'm really big at doing an apples to apples comparison.
First, and most basic, do a quantitative evaluation. What is the cost per hour? This may only be an estimate, but try to get it as exact as possible. What is the student to instructor ratio? How old is the school? Is it a Le Cordon Bleu school and if so, how did it rank the last time it was evaluated? What percent of students graduate? What is the job placement rate? What percent of students are fresh from high school (>20 years old) and what percent are career changers? What percent of the time in school is spent doing hands on work? Lecture?
Next, do a qualitative evaluation. This is much more introspective, but you need to be honest with yourself. Try to dream impossibly big. Are you willing to go to school out of state? Are you willing to perminently relocate? Where do you see yourself in 3-5-10 years? Be brutally honest. Don't expect to have too many answers here, just as long as you have spent some time thinking about these questions.
I recommend making up a nice Excel spreadsheet for this evaluation. I'd only look at 3-4 schools, but make sure you get a couple of good names from a couple of different parts of the US. Depending on what you are looking at I would recommend: California Culinary Academy (West- personal bias!), The French Pastry School (Midwest), Culinary Institute of America or French Culinary Institute (East). The costs vary greatly, but you will get a well rounded, useful education from each of these. Yes, you will still start from the bottom once you get out of school, but you will progress more quickly because you will understand the why and how behind what you are doing.
Last, but not least, don't over think this too much. Sometimes you just need to know that you are passionate about something and then dive in. All the questions will be answered along the way. Yes, it is scary. Yes, it is a lot of money. Yes, you will suck at the beginning, but everyone sucks at the beginning. It all works out. Lots and lots of practice and learning patience.
Good Luck!