Ue4 how to create plugin?

i want create a plugin to show face animation and change Animation property, i need a viewport to show face, and other viewport to show property detail, but it seems a little talk about it. where can i learn more ?

I cannot tell you specifically what to do, but you should start by looking into the engine documentation.

Go to edit >plugins > and on right down corner click new plugin then just chose what you want.