First you have to know your stuff about cancer, so you would want to get into the field of Science and cancer research. Then, find an organization, maybe get into the broadcasting field, and see if you can help them spread the word. Unless you are actually a cancer researcher/marketing broadcast, you won't get paid probably for this kind of job. You can go to any cancer organization fundraiser and tell them you would like to help. Also you can just make your own little booklets to give out and give speeches about cancer to everyday people like on the street or have a little booth at a festival. I don't think you will make money from this though.