I think I would be inclined to pass on the project, then.
It's easy to transfer those images and it will take quite a bit of effort for an absolute 3D beginner to make a hand-grenade with Blender. You can't convert the images in blender, you will have to make a 3D model. All the image will do is be a guide. There is no "make object from image" tool.
Expect to take many hours to build a grenade as good as the provided example.
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