If you're still searching for a job these sites might be helpful to you:
http://www.snagajob.com/c/teen-jobs/
http://youth.gov/youth-topics/youth-employment
http://www.youthrules.dol.gov
Are there local organizations that provide resources for teens searching for jobs? I live in Los Angeles and there are several programs like YEOP (Youth Employment Opportunity Program), JVS (Jewish Vocational Services, but it's open to everyone regardless of their religious beliefs), and job fairs through the Boys and Girls Clubs. Some employment agencies such as Apple One will accept teens for temporary work, some of which is long-term and pays decently. A friend worked all summer for Sony Studios. If you like baby sitting you could look into into whether there are local agencies or sites that represent sitters. I know there are some here that are popular.
As for paying for college and graduate school, you might want to do research on the financial aid policies for the colleges you're interested in attending and finding out what sort of package you might be eligible to receive. I believe there are financial aid calculators where you can punch in the annual income of your parent(s) and other relevant information, and then it will tell you what kind of assistance is plausible for you. My college has a really generous financial aid policy, but others are not as able to give nearly as much. There are scholarships, low interest loans, and on-campus jobs available to many students. If you have a high GPA and your family is lower income you might qualify for
QuestBridge.
I've been dancing since I was two and a half, so my passion for it evolved into a job teaching dance and choreography. I worked at a dance studio over the summer teaching intensives (sort of like day camps) to elementary school kids, and then my high school hired me to choreograph the dances for recitals and other performances this year. I also make an income from selling my art at festivals, and songwriting for friends who are musicians.
If you have any special interests or pursuits, look to see whether there are any job possibilities with it. I also had a paid internship in an office this summer, and the interviewers told me that it was my cover letter that impressed them and caused them to consider me. Normally the internship goes to college grads, so I lucked up. I definitely recommend reading through sample cover letters and resumes online, and then crafting your own. Also don't be afraid of rejection. I sent out more than 50 resumes and cover letters for one summer job. My philosophy was that the worst thing that could happen would be I wouldn't get a job I didn't already have, so it was worth the time to put forth the effort.