No worries!
There are several different ways to add layers. See here:
Add layers—ArcGIS Online Help | ArcGIS
Do you have access to ArcGIS Desktop (ArcMap or Pro)? I would publish layers from there (which is what I do). Looking at the popups situation: "You can configure pop-ups in ArcGIS Server service layers, hosted feature layers, hosted tile layers, and layers from files."
So you need some kind of feature layer. Here is an article on publishing a hosted feature layer:
Publish hosted feature layers—ArcGIS Online Help | ArcGIS
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