Sorry, but we are theme support. We are able to help you with bugs related to our theme or explain theme options. I don’t understand how the questions related to your personal development process of some third-party plugins related to theme support.
You are not allowed to develop any personal plugins based on plugins bundled with our theme, it’s illegal using of bundled plugins! All the plugins that you get including WPBakery page builder can be used only with our theme if you don’t have an extended license for that plugin and plugin author did not allow you to use it in your product https://help.market.envato.com/hc/en-us/articles/213762463-Bundled-Plugins
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.