Advanced teams usually do everything. Usually consisting of some objectives being done better than the other though.
Regular teams will usually choose 1-3 things that they can do well.
That being said, FTC is a few months long, compared to FRC. I would start the freshman off with focusing on 1-3 parts of the game, and if you advance through the qualifiers/regionals, think about expanding into more areas.
Chief Delphi is not too popular with FTC. Look into the FTC Sub reddit, and
http://ftcforum.usfirst.org/forum.php