Set goals with your teenager. If she has a vision of her future, sit down and make a plan of how to get there. This will give you a basic template of the curriculum that will fit her needs.
Get to know the standardized tests used for college admissions. Many test preparation books are available for the PSAT, SAT and ACT.
Do some research. Start looking at college admission requirements and financial aid at least two years before you have to. This will give you plenty of time to acquire needed documents and do the necessary paperwork.
Build a portfolio. Start pulling together material that shows off your homeschooled teenager's abilities and education. Journal entries, letters of recommendation, essays and hands-on projects may all be used to show her strengths.
Visit your local college. Encourage your teenager to take a class or two at your local college or university. This will expose him to the level of work required in post-secondary education and expands his horizons.
Help her find a job. Encourage your homeschooled teenager to find a part-time job doing something she enjoys. This is a good way for her to learn about her own interests and the working world.
Encourage him to join a club or team. Life can be lonely for a home educated teenager, make sure he gets out and meets with other teens regularly.
Promote new hobbies for your teen. Allow her to continually search for new interests. You never know what direction her future will go.
Invest in travel for your teen. Seeing new places and new faces is one of the most educational experiences he can have. Whether close to home or far away, travel will add enormously to her homeschool experience.