Sketchup is horrible for PCB designs. If you want to do PCB designs, get the free hobbyist version of Cadsoft Eagle or Diptrace, or if you're into OSS software, KiCad. Those would be appropriate programs for designing PCBs in (I know, I use all three). From those you can export Gerber files to either convert to G-Code to mill a single sided PCBs, or send the Gerbers to SeeedStudio to have them produced cheap, or print negatives to do PCB etching. My preference is to order PCB's from SeeedStudio. Most of my designs are under 50mmx50mm, so it's $10 for 10 PCBs. I'll likely be ordering a batch soon to make some quick disconnect shields for the TI Launchpad for my control interface design.
--Rhys