I share my Apple ID with my son I need us to separate can I create a new one

Your should never share an Apple ID, they are meant to be user specific. And yes you can and should create a new one. You can use Family Sharing after that if you wish.

How to create a new Apple ID - Apple Support

Set up Family Sharing - Apple Support

Create an Apple ID for your child - Apple Support

Once your son has his own Apple ID, his Apple gear needs to be thoroughly cleansed as follows before he “moves in”.

What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support