Error creating child theme

Hi, before starting I want to say thank you to everyone who can read or comment, also I hope it can be usefull to other people that may have the same problem. Thank you so much. This is my problem:

I′ve installed Appetizer Theme in my WordPress website, but I′ve forgotten to create a Child Theme before starting customizing the site.

This is my first time creating a Child Theme (I want to do it in case I have to update WordPress, everything looks the same if I add new CSS, for example).

So I′ve created a new folder named Appetizer-child and inside of it I′ve created the style.css and functions.php files. I′ve activated the Child Theme without errors, but when I see my web site, I′ve lost all the customization I had made before activating the child theme. Also the services sections dissapeared, and I can′t add any.

I was thinking on customize everything again in the Child Theme, from the begining, but meanwhile In the parent theme I have the option to add 4 services sections for free in the home page, plus a product section, plus a blog section… the problem is that in the child theme I can′t add any, the button to add is dissapeared so my home page is almost empty.

If I activate again the parent theme, everything appears again. But I want to use a Child Theme. ?What can I do to solve it? ?What can happen if I only use a Parent theme, when I update WordPress can I loose my css or some styles or changes? ?It′s because I have to buy the pro licence to have a Child Theme?

Thank you!