Creating a form using only PAGES, possible or not possible?

Well, Pages gives you a good variety of templates. If you don't find one you are looking for, you may have to make the format yourself.

Not sure if I answered your question but I hope I did. I'm here if you need anything else.

Pages is the wrong tool if you are looking to create form-based documents, because it does not provide any form creation tools, as you would find in the free LibreOffice, or MS Word applications. The latter two products would allow you control your tab order too.

Are you trying to make a form that people fill out, or just a normal document of some sort?

You are welcome.