How do you stop landing on the nose when you 360 flip i have tried leaning back and jumping back but the board just comes back with me What is wrong?

You have to scoop the board more.

I know this may not be appealing to everyone, but wear skinny jeans. Many people find it "gay", but it truly helps in Skateboarding, as it allows you to see the board more without your pants getting in the way. The tiny bit more vision you have certainly helps you when finding the board as you are coming down and the board's flip comes to an end and you are ready to land. Wear skinny jeans, it helps. Or don't.