Practice air (and ground) dribbles and flip resets, learn/bind air roll left or right, try to learn how to stall (stalling isn't super necessary tho, but its good to learn when you have the basics down), find/use one main car. You can find some good tutorials on YouTube for resets, dribbles, how to stall, and what air roll left/right is. Keep practicing the basics, you'll need them as muscle memory for when you go for clips either in training or in game. Practice practice practice, freestyling is a game of consistency, as soon as you get consistent, you'll hit better and more complicated clips/shots. But it might take a while to learn, I've been freestyling since 2018, and I'm still trying to get consistent with my resets and aerials. Glhf hope that helped