Thanks for your time and your detailed answer, very appreciate that!
I tried to check-out your suggestions today and came also to the point i should do something a bit easier 
Nonetheless, i’d love to understand a few more things.
To 6th: Where can i set the varying degrees of the vertices?
I tried it also another way today (https://answers.unrealengine.com/que…u-with-bp.html). Looks very similar but i think it looks more like the waves are really really small (Enclosed a screenshot). So my last hope on this are the mesh settings you talked about.
And one more question depending the inputs: In my first tutorial was told to leave the inputs empty and set the check “Use Preview as Default Value”. In the way i tried today (https://answers.unrealengine.com/que…u-with-bp.html) There are Values on the inputs. What are the cases to use values and when its better to leave the inputs empty? Where do they get the values from then?
Thanks and kind regards!