S.W.
Volunteering is a very good way to see if a career is for you. Also, getting to know people who do the work that you are interested in and talking with them (interviewing them) to find out more about the realities of the work.
If you don't know people in the field, there are many resources to find people - through volunteering, through an agency or non-profit, or through a networking website (www.LinkedIn.com has become very highly regarded and used for finding people to network with, and for finding jobs).
www.iSeek.org is a website that was developed for people making career decisions and has information about future demand in a field, education needed, etc. It was developed in MN but would be useful for any person seeking career information.