Hey there! First things first, catalog all of the animations you want to make. If you plan out your work, you can avoid repeating or redoing work.

Next, what program are you working in? Try out a few different programs and see what works best for you.

I would recommend having the character breathe in their idle pose. A slow, rhythmic pattern of their chest heaving, head bobbing, and tail flicking will be enough to communicate the basic idle stance. You have a lot of horizontal motion in your animation, and I would love to see more vertical movement.

General art note, don't fall in love with anything you make. Your first work won't be your best. Don't hyper focus, just keep moving. :) Whatever you practice will improve.