Hi,
If you want to create your child theme from scratch, you can read this useful information in codex – https://codex.www.ads-software.com/Child_Themes.
I have found also this plugin – https://www.ads-software.com/plugins/one-click-child-theme/ – it helps you to create child themes for any template you want. But, I am not pretty sure if it still working because it has to be updated for two years.
I wish I helped.
Regards.
