Organizing a walk to raise awarness and $ for epilepsy- walk across the united states from san fran to dc?

My friend and I want to walk across the US to raise $ and awarness to find a cure for epilepsy.How do I go about organizing and finding sponsers for an event like this? We would also nedd a SAG wagon or a support vehicle- any ideas thoughts or suggestions would help us tremendously!
45 minutes ago – 3 days left to answer.