Hi @nadadesign 
Just publish the theme you want to be live, your waaay overthinking it.
Read the friendly manual https://help.shopify.com/en/manual/online-store/themes
https://help.shopify.com/en/manual/online-store/themes/managing-themes/publishing-themes
use previews to compare, etc https://help.shopify.com/en/manual/online-store/themes/adding-themes
etc