In case you have any young ones of your own considering this stage of growing where they learn to care for others, or want to explore the world of business, there are some pages online trying to help out.
For instance, the University of Illinois has a great guide to The Business of Babysitting.
It's pretty well done.
Babysitting isn't for every teen, and there's another site that recently launched that might interest teens in other pursuits. The Small Business Administration started up the The Young Entrepreneur Online Guide to Business.
It includes thoughts on finding a mentor, and links to help. It also discusses money and saving and investing, legal issues, and how to develop a business plan.