The photo above shows how you should animate action poses. You start with the first poses, and then you fill the other poses in between.
If your animation is looking pretty dull, maybe you forgot some of the principles of animation. They sharpen up your animation and make it better.
You are gonna need a style of animation to spice up your little animation. There are many different styles, but shown in the article are a few!
Before you start making ideas, you need to think of that animation software you're gonna use. Some are Adobe Flash and TVPaint. Both of these softwares are great for 2D animation. Don't know how to use them? They luckily have courses all over the internet on how to use them.
Before you want to start making ideas, you want to find what type of animation you want to do. Traditional, Vector-based, and Tweening are some types of animation!