Good luck with Blender! It is one of those 3D programs you either ‘get’ or you don’t. I’m afraid I am in the latter camp but I know that Dan is now competent in using it. That said, maybe it is possible to use the templates without knowing the rest of Blender – there are a LOT of free/low cost Blender models available.e.g. link
However unless you are competent like Dan, I’d recommend Googling for low-poly Blender meshes, as the article implies some clean-up is required if you want to avoid really tiny folds!