Photoshop images, size them for prints and create pdf's for printing for specific website

Hi, I create artworks which I sell as prints and online. I am looking for someone who can photoshop my photographs of original artworks so the colour and final image is good for printing and then I want them to be saved in a few different sizes so they can be sent to my printer locally. At present the sizes I need are: Inches 6x4, 8x10, 16x20 I also want to get cards printed of the artworks and need these images to be saved as pdf's with crop marks for the following printing company: [login to view URL] (all instructions are on their website as to the format required) I have at present 10 images that have already been professionally scanned and saved in the above print sizes but need them to be converted to pdf's for gogoprint. Have enclosed a sample image of the sort of thing I do.