This is not what a PDF is for. If you want to do business cards, I suggest looking into data merge.
Even if you could do what you want you’d need to export an interactive PDF which would not be press quality.
The question isn't entirely clear to me.
It sounds like you want the user to fill in page 1 with his or her details, and that these details will then appear on the business card which is on pages 2 and 3?
If you create form fields in InDesign, and give them the same name anything that is typed in one form field in Acrobat will also appear in all other fields that have the same name.
Does that help?
I am not at home to try it out right now but it sounds that it is exactly what i want. Thank you very much
Applying paragrph styles is not possible though according to what i have read so far, right? That was why i tried to mess around with text variables...