There are many rankings available. For US schools the most trusted one comes from
US News. For international rankings, you can check many sources, like
FT,
The Economist,
Forbes,
QS,
Whitefield. Some are not reliable at all, but you can get an idea about what programs are around.
In the FT rankings, and in most of the others, you will find links to each university where you will be able to find info about costs, scholarships, etc.
In order to get info about the school, you can search the blogs, ask the admission office to put you in contact with current students or alumni, or you can use websites like Facebook and look for groups of alumni. Plus you will find loads of info in this website, surf it and you will see how valuable it is!
Have fun!