I'd say that you should review the scores at the end of the Warzones you are playing, and look up some of the higher scoring members of your class on your server and ask them for advice. That's what I did.
Once you start doing the dailies and Weeklies, you'll gear up with the PvP stuff in no time.
Until then, if it really matters, look on the Galactic Market for some decent modifications for your armor, or some crafted purple armor pieces. Those are usually ~Tionese level.