The first thing you need to do is relax, and try not to stress out. It's okay to feel anxious when you're not sure how to do something, but planning is really not all that difficult. Cancer walks are nothing more than people banding together in the quest for the cure, doing their best to raise awareness and money for research. The only thing you have to worry about, of course, is making as much money as possible - not just from pledges, but in any way you can.
Cancer fundraising walks can be about more than just collecting pledges from friends and co-workers. You can really boost your fundraising income by supplementing your pledges with extra fundraising ideas. While you are going around collecting pledges, why not take a box or two of our $1 fundraising candy bars with you, and sell those while you are asking for pledges? Even in this economy, pretty much everyone has $1 for a chocolate bar, and if every one of your sponsors buys one or two, think about how much extra money that can add up to. You can also carry something like scratch cards on the actual event days of cancer fundraising walks, maximizing your fundraising opportunities even more.