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Are there any requirements for UE4 beginners?
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You should be able to use a mouse and a keyboard ^^ -> Just a little joke 
Of course it is a big plus when you already have C++ experience, because then you dont have to learn the programming language from scratch and you can directly jump over to the “c++ connection with bps”. For all the other stuff like level design, fx artist or 3d artist you just have to play around a little bit. So download a 3d program like blender and then start doing some stuff. It will overwhelm you in the beginning, but the more often you do it you will get used to it.