my understanding of character controllers is very limited. I'm guessing you bind certain keys like the arrow keys and/or wasd to add or subtract to your character's position on the x and y axis.
edit: I didn't know anything about setting up the velocity. I was able to add an animated sprite but I haven't figured out how to make it move when the player presses a button. I also want it to stop animating when the player lets go of the button. I guess i'll have to look into what else you can do with scripts.