I'm looking to start a nonprofit organization that would help raise money.?

My foundation would raise money for people who are missing, military families and troops, individuals with health conditions, and much more. My mission is to raise one billion dollars by walking across the states, and then furthering my project. I'm hoping to get followers who are interested in helping me spread the word through the internet and face to face. Maybe I'll get some people to walk with me! How can I get started?