Scripts for beginners.

Hello! Here's the situation: I'd like to create a cool, simple mod for Heroes 3 in VCMI for my friend's birthday. I just want to add a couple of artifacts with my own design, at least. But I'm not very good at programming... I managed to create a JSON code for the artifact itself, but, as I understand it, the problem is attaching the animation file in .def format for display on the map. I've been looking for information on how to create these .def files, but I haven't found anything. I just want the image to be visible during the game and to be able to pick it up. Is it possible to convert a PDF to a .def file or write a JSON code for a sequence of images (I think that's also possible)? I really want everything to work. Thank you in advance!