First, you’ll need a program to draw. For this, since you ask it for free, I suggest Gimp. It is free and works fine. Since you also want something animated, I can also suggest Adobe Flash (but it isn’t free and actually very expensive if you are using for hobby). If you want animations, you might also try 3-D desinging programs like Blender (they can be used to record movies with desings). Other than that, search around the web to find a program that can create animations( and you might check out animated gif makers)
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