PDF Form users can SIGN and it's saved as a PDF

I don't know where to begin. I just got a "full app" Adobe CC subscription.

I have a few PDF forms that I need users to SIGN then I need to save a copy of form with their signature as a PDF. (So it appears as a signed document, not database records somewhere else.) What's the best way to do this? It's a doctors office basically and they are signing some forms.

We have the option of them signing on a tablet, like an iPad, a iPhone, or a computer. (All owned by the doctors office.)

I'm not even sure the right tool for the job. Any feedback or recommendations appreciated!

Thanks!