...and don't despair. Remember, comics are created one panel at a time. When I was honing my drawing skills in preparation for comics, I'd generate pages and pages of sketches. Then I'd get a large pad of tracing paper and lay out a page at 200%. Step#1: pencil in the text. If you've got narrative, that goes in first. Anything left over is for art panels. Tenatively, lay out the panels. If there's Thought or Speech balloons, pencil them in. [or put them in the topmost layer in Photoshop.] Now, get your screenies and start sliding them under the panel spaces. Enlage, reduce, crop as needed. Adjust panels as needed. Pretty soon a page comes together. Then do another. Before you know it, you've got a story.