For the number of fields, you can make "multi-page forms", just use a "next" button to go to another layout with more fields, should be easy enough.
As for going from "landscape" to "portrait", that only really matters for printing. Ask what width the client wants the layout to be, and create a guide that shows you that width in layout mode. Then drag the fields into whatever placement fits well.
Filemaker's layout tools are great for that kind of stuff, snap align and everything.
ok so I can create more than one form iin the same database and if users need to navigate to another form I can just put a Next button on and it will show on the Webdirect page???
you can create hundreds of layouts based on the same table. I'd highly recommend filemaker training.