I need help with a PDF form that has mandatory fields, signature areas and can be emailed

I created a 33-page PDF form that before just needed to be emailed. But now we need mandatory fields, signature lines, and upon completion emailed. But now the mandatory fields are not being prompted as an error when the email button is clicked.

The form should point out the areas that aren't completed or signed before it can be emailed. I have double and triple-checked and can't figure out why the form can be emailed when all the information isn't completed. I'm not a programmer, so this is out of my knowledge. I did find some Java for the email button, which works fine. How do I get this to all work correctly? TIA for any assistance/guidance you can give me!