Selling Pics

Hi All,

I would like to put some pics on Photobucket for sale, with proceeds to the local Air Ambulance.

What are the mechanics of this?
Is Photobucket the best place?
What are the pitfalls?
Do I charge 25p per download (how?)and hope for hundreds/[thousands] of downloads or go for a much higher (exclusive deal also how?)
What are other questions I should be asking.

regards
Bernard