and send the resulting gerbers here: www.oshpark.com. They have excellent quality and amazing prices.
Makes me wonder: how did you make those pdfs in the first place? Hand drawn?
Nope, most PCB cad software has this option to print a PCB out in pdf, and that's exact replica of the original PCB size wise. It's just a quick way to measure that all the components will fit on the final PCB. Even eagle CAD has this feature.