Idealist.org has an excellent list of organizations that have one-year programs, so please visit this page and start clicking.
The National Civil Rights Museum put together an educational program called the 50 Weeks of Action Plan. It is archived here and is still a good learning and action resource. Also, be sure you know the answer to the question of why this Memphis, Tennessee museum is located in a motel!
This one requires commitment which is why it is in this category. It won’t take a whole year of your time, though. You can still work, study etc. But if you can commit to a period of time, please check out MENTOR, which is a clearinghouse and a support organization for mentoring. Just plug in your address and you will find opportunities to mentor a child in your area. If you’re nervous or aren’t sure what you would do with a child, this site gives you a LOT of resources. Something to explore for sure!