For the Bnei Akiva birkonim I have links to templates in illustrator and photoshop to allow people to prepare their files themselves. However, not everyone has these software programs. Is it still possible to prepare files yourself? YES! You just need to make sure that the files are appropriate print resolution (300dpi) and appropriate size. The prreferred file type is PDF.
Above I’ve included an image of the dimensions that your file would need to be, both without and with bleed (if your design goes to the edge of the cover. In order for the cover to have complete coverage, a little extra design is added so when the cover is cut the whole area is still covered by the design.)