Creating a resource image thumbnail for use on page - no stacks

I want to create a page of printable PDFs. I have uploaded the PDFs into resources (I have rapidweaver8, using mountains theme). But when I drag it into the styled text page, it is much larger than I want (as I’d like to be able to show several at a glance).

here’s the page as it is. http://www.piratesguidestory.com/printables/ (for me, in Chrome, I can’t even see the images, only titles; in Safari I see a long page with nearly full page photos) (EDITED to add :: I ended up turning the first page of my PDF’s into a screenshot and using that, which I could then scale - but I’d still like to know if there is a way to edit a PDF image to scale similarly.)

My goal would be a page that operates more like my storefront http://www.piratesguidestory.com/page/ - where there is an image and a caption, and clicking on the image opens up a new page with the PDF read to use/print.

I am just using RapidWeaver 8 out of the box, so to speak, and I’d prefer NOT to have to purchase any stacks to make this work.