For general information, go to the "Degree Descriptions" page of this web site.
Now, to get to the meat of this page, read this passage from an article by Professor of English, Leonard Cassuto, in the Chronicle of Higher Education:
[G]raduate school is professional school, not a concentrated version of an undergraduate major. Unless you're rich and want to do it for fun, you shouldn't go to professional school without a professional direction or goal.
More important, it's a bad idea to commit to a profession without ever having worked full time. It's pretty silly to spend $150,000 on law school, for example, before ever having had a self-supporting job. What if a would-be law student got a job importing rugs and discovered that she loved it? Perhaps she would skip law school entirely and make a different life.
I urge you to read the whole article, and the other articles cited within it. And check out the book the author recommends (Is Graduate School Really for You?: The Whos, Whats, Hows, and Whys of Pursuing a Master's or Ph.D. by Amanda I. Seligman, published by Johns Hopkins University Press, 2012).
If you're considering law or business school, check out the following links.
Know what’s in the water and at the bottom before jumping into the lake.