You can have multiple views, configured however you want.
Best practice is to break your paper-based thinking and use more of a wizard style collection.
Use multiple views and a next button which takes the user to the next view for completion.You can also conditionally hide sections or items so that they are not visible unless needed based upon the user or other values.
Since it is all on the screen the concept of landscape or portrait is not real relevant since you can size everything the way you need it.