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yes, the Weebill S can support your camera, these fuction is in the Weebill S, so you can use it once you can balance your camera on the weebill s, but you also need to know that you can't control the the d3500 via weebill s. 

Hi. Yes it is suitable , in fact , that's the very camera I'm using it on. It rather depends what you mean by 'fully'. The camera will not use any of it's auto features because the lens is totally manual , there is no metering and also the focus aids don't work. However , the camera takes pictures with a tamron lens perfectly well . Set it to 'M' on the dial and then set your own shutter speed and aperture . It will look a little dark through the view-finder ( at least it does on my 135 telephoto lens ) but the pictures come out fine . 

Rotate the white ring can set apertures 

Yes, it is indeed Nikon f mount.