Despair not, Floppit! It takes a bit of time to familiarise yourself with the awesome technology of Stripgenerator - ie "How do I make a ghost look fuzzy?" and "I wonder how you turn the background red?" I think the best way to start is to illustrate a woo quotation rather than jumping in at the deep end with a completely original concept. Once you get the knack inspiration may follow.
There's a lot of potential here for sceptic-tinged cartoons. Someone from the JREF Forum once used Stripgenerator to make a whole series of comic strips about one "Bishop Bonkers" (Sean Manchester) and his arch-enemy David Farrant, two of the protagonists in the Highgate Vampire Saga. Unfortunately the enterprise ended in tears when both the cartoonist and David Farrant violated Stripgenerator's copyright by using the images on T-shirts and a self-published pamphlet!