Trust me, it is MUCH easier to design the artwork first and then use it as a template for making your CP. This way you have ZERO worries about stuff not lining up. I did mine the other way around, and I'll probably have to spend $20 to $40 on initial "drafts", not to mention the unrecoverable time spent measuring and re-measuring everything, before I can even print out my artwork. If I could do it all over again, the artwork would be the FIRST thing I did.