Hello Ella,
Thank you so much for using our theme SuerNewsPro. Please find your answers below:
1. Please read this blog post to know the importance of child theme. If you are not a developer, no need to activate the child theme.
2. Yes, please add your site URL to receive updates. Read this post for more details.
3. You can use theme lifetime, although supports and updates are only available for a year.
4. If you completed the step 2 above, you can update the theme with a single click on backend like WordPress free theme updates.
Let us know if you have any further query. Please visit our blog page for more details.