Define your values. Consider a few issues that you feel deeply about and try to identify the core thread of conviction that runs through them.
Separate what values are essential to you from beliefs imposed by the external culture. It can take some time to develop a sense of what principles guide you, rather than what you have been told to think and do. Many people move through a phase of conformity followed by a period of rebellion, without ever understanding both of these are forms of reaction rather than authentic action from your own core beliefs.
Let your values begin to shape your behavior. Become alert to the nuances of your everyday thoughts and actions. Look at how you can enact your principles rather than merely holding them as an abstract ideal. For instance, if one of your values is a belief that all humans are equal, take the time to examine the automatic assumptions you may make about people based on race, religion, gender or sexual orientation.
Use your values to define a vision of what you want to achieve in life. This is different for each individual: for some, the vision will involve a professional goal; for others it may be raising well-adjusted children; for others it may be working towards a specific change in the world.
Develop strategies for moving towards your vision. Realistically assess the discipline and sacrifices necessary to move closer to your vision. Accept that not everyone will share the same vision and values which guide you. Decide what actions you can take on a daily, monthly and yearly basis to move closer to your goal.