@lancealotg The image used for the paper charts and checklists will need to be at a 724x1024 resolution and in a .PNG format.
Once the update is released, if you would like to replace the included checklists with your own, it should simply be the case of changing the file names of your new checklists to the same names as the included checklists, and then dragging and dropping your new checklists into the folder and overwriting when prompted. It should all be pretty self-explanatory once you get the final build, but please do let us know if you need any assistance.
I have attached one of the checklists that will be included in the V2 update as an example:
Paper_checklist_2.png
Hope that helps.
Mark - Just Flight