Enfold child theme – where to construct the actual site when starting?

Hi there!

This might sound funny, but it hasn’t completely made sense in my mind yet….

If I upload both Parent and Child, – co’s I’m planning to make several changes, then I realised I’m able to upload the CONTENTS to the CHILD theme, it is convenient at all?
I fear that if I activate the child and start building the site in there, then my Parent theme will be completely empty. Won’t it?

Should I first activate the PARENT, populate it with CONTENTS and then activate the CHILD to begin customising it?

Can I add all of the QUICK CSS to the PARENT to see them reflected on the CHILD or just migrate those codes directly to the CHILD?

Thanks in advance,

Best,

hacart