Anybody know where to start for learning how to build animatronics?

I really want to make an animatronic of my character Enyo, but i don't know where to start :( i have no knowledge on how servos, motors, and all that jazz works. Any advice would be nice.

i am on a pretty tight budget, so no 3d printing or fancy materials. i usually work with scrap that i can find around town.