I have a few tips to begin on animating:
-2 free and cool apps to use are flipaclip and stick nodes
-If you use flipaclip, practice drawing, so that you can get used to drawing each frame perfectly
-you can use sticknodes if youre not much of an artist.
- For using flipaclip, the first thing you should do is use the tutorial to animate a ball bouncing. The simple ball can lead you to an entire tree of knowledge to animating