I need to know about the touch mouse of magic keypord for ipad 12

So you want to set up the magic keyboard? If that is the case, then try this.https://support.apple.com/en-us/HT211091

If you want to set up the magic mouse, try this https://support.apple.com/guide/ipad/connect-a-mouse-ipad10939edf/ipados

If you want to set up the magic trackpad, try this.https://support.apple.com/guide/ipad/connect-magic-trackpad-ipad6b9203a2/ipados

Hope this helps, have a great day!