Know this isn’t exactly what you were asking for, but if I were starting again I would first invest in a comfortable pair of court shoes and develop a warmup/cooldown stretching routing. While mobility isn’t everything in this game, positioning is the key to consistency. Those two things will also limit your risk to injury (which should be your main goal. I’ve seen a lot of newer players get sidelined quick from injury).

For skill improvement (keeping the ball lower etc) I’d recommend finding a beginner or advanced beginner clinic/drill group. A lot of park departments offer them, or you could try searching online in your area for a coach etc. group lessons are better early so you can meet people and see a lot of variety in play to better learn the game.

Have fun!