@Wanderer_eternal: If I remember correctly, when you add the GamePad controls you automatically get touch controls for free when you package your game for Android. I recently went through these tutorials - Introduction to Third Person Blueprint Game Playlist.
Tutorial number 15 Character Blueprint: Gamepad and Touch Controls covers this and shows you how easy it is to do.
You could then use that and modify the graphics that are used by default for these touch controls.
HTH. 8-}