hmmm, well i dont really know how to make artwork all that much.  i know how to do stuff in photoshop, but i dont know dimensions, how to set the dpi, and all that.  i dont want to create some elaborate art design only to have it all pixelated when i print it out at kinkos or whatever.  but if i decide to put artwork on, what type of paper do i need it to be printed out on?  and if i get some cp art off the net, if i just save it to a disc, and take it to kinkos, will it looks good?  
also, can i buy lexan at home depot or lowes?