Simple Android Game

Alright so ive done some digging and i can’t really find the information i need. So im just a 3d artist, but i have an idea i want to flesh out in ue4 with blueprinting which i know my way around them somewhat, but every tutorial you find on putting in characters is mostly for a fps game. So basically I have my model i want to be a character, it is a simple catapult, picture below. It will basically be launching rocks, and the farther u drag the catapult back the harder it throws them, essentially sounds simple, but i cant seem to find anything anywhere on how to go about this, can anyone give me any pointers?