Good job for first
Definitely a good job for your first time. I do have some suggestions though. Like making the movement more realistic. For example, you need to make the ball move faster when he throws it to the ground and especially when it goes into the air, it looks like it is levitating. Move the ball much faster. Also, some annoying reality to point out, balls don't bounce on sand. Overall, though, this was great for a first time, and I'm sure you will do well the more you practice flash.