A few people have provided helpful online tutorials, to teach you how to
create artistamps, one step at a time:
One was at the Arky
of Toast's website, where Greg had lessons using Adobe PhotoDeluxe and MicroSoft
Publisher. Last time I checked, his site just said "fishin'". [Please
let me know when he returns. Thanks!]
But, he seems to have left a list at
ArtistampNews.com,
and some of them mention tutorials.
Or, if you're using Adobe PhotoShop, check this step-by-step
demonstration at Fertile
Press.