This should help you:
http://www.filemaker.com/help/html/edit_layout.10.30.html
This should help you:
http://www.filemaker.ws/help/html/edit_layout.10.26.html
For your #2 request, sounds like you need to script the record creation. You can do this by creating a single record in the match table, setting the match serial # as a variable (IE set variable $id = match::serial). Then go to the Rounds table, create two records, and assign a foreign key (IE set field round::parentKey - $id) to relate it to round.
You can execute this script via a button so that creates all three records and returns to the match form view.