I got a new Iphone. Now my husband gets my calls and messages. I suppose it is because we share an ID. How do i get it fixed?

Create a new Apple ID for either him or you and then follow this -> Set up Family Sharing - Apple Support

I have this same challenge, we have two phones, an iPad and a Mac, all on the same Id. Now we are thinking of getting two watches, before we do that I want to put his two devices on his own ID, but I'm not sure how to do it! It's a mess!! Don't just tell me we should have our own, I get that! How do I separate everything?

Stop using the same Apple ID