2d enemy on a 3d game

Hi, I want to make an enemy for my 3d game using 2d sprites and i have no clue how to do it, i know how to make the code for it to work, i only need help for creating it and animating it.
The idea is to have a 2d sprite always looking at me.

I would suggest using a plane in the 3d world to render your 2d sprite image. you could change the image in the plane for “animations” and move the plane as if it were a 3d model.