You are required to provide a telephone number in order to create an AppleID. No way around that requirement. And you would not be adding it to your iPad as an iPad cannot have a telephone number associated with it other than when linked to an iPhone. You’re only providing the telephone number for your AppleID account information.
But why can’t you use your existing AppleID? The one you’re using right now to login here to the forums and post? You don’t need a new AppleID just because you have a new device.
If you did make a new one, it won’t have any access to anything currently tied to your existing AppleID.