Not to be trite, but look at the various posts for celestial tourney strategies, then pick two
strategies that appeal to you for each fight. Try not to have cross team pets (meaning no pet used in more than one strat, or if a pet is used more than once, make sure it's undercard strats for mutually exclusive guys).
Those are the pets you should focus on leveling next.
Now personally, I'd suggest leveling them all, just to be safe. once you can beat the pandaria tamers (including the spirit guys), it'll only take you 5 months or so to level the rest of your pets doing just that.
I suppose I should link to my old post too: Tiggindy's advice for pet leveling