Not a lot of schooling is needed for this career. There is no requirement for a degree, but taking a few writing classes certainly isn't going to hurt. There are no training requirements, either, but you should have a basic knowledge of grammar, spelling, and so on. Some degrees that can be helpful in freelance writing/blogging are English, Journalism, and of course, Writing.
Some schools that offer freelance writing as a major are the University of Wisconsin-Madison, UC Berkeley, Florida State University, Bentley College, and the Kansas City Art Institute.
