Deleted Files and Folder on Card

Somehow all my mini SD card contents were deleted.
Can someone tell me what I need to do to start fresh? This is very frustrating. I’m not sure what folders I need to create or what to do in general.

You are talking about your front SD card right? In that case, nothing needs to be done because the file structure will be regenerated the next time you mount your card.

If you are talking about your rear SD card then this is what you do: