Newbie advice needed

My son and I are going to try fly fishing. We have purchased the
Cabela's Three Forks rod that comes with the Prestige Plus reel in a
6-weight with a WF floating line. I've been reading everywhere about
how important the line quality is. Since we're newbies with "starter
outfits" are we ok with the line that comes with this combo, or would
we be better off upgrading the line? We could afford to upgrade the
line to something better if it made a difference. If not, then we
won't bother. Thanks in advance for your help.