You’re going to be using two different sets of armor for WvW and PvE. If you’re doing primarily PvE, you’re going to want to invest in Berserker’s armor (or knight’s to start w/) and it can be obtained for free w/ dungeon tokens: Citadel of Flame, Crucible of Eternity and The Ruined City of Arah. The trinkets and rings can be obtained for free from guild missions/laurels/pristine fractal relics, and the back pieces can be crafted (for a bunch of cash) or obtained from fractals.
WvW armor (forgive me, but I think that soldier’s is the meta for that, but if I’m wrong, someone please correct me), can also be obtained for free from dungeon tokens: Ascalonian Catacombs, Sorrow’s Embrace and Honor of the Waves Dungeons. Tokens and rings can be obtained the same way.
Your weapons should be berserker as well, for both game modes, and they can also be obtained for free from dungeon tokens (the same places I mentioned earlier)
Those weapons and armor aforementioned are all “exotic” quality. “Ascended” is better, but since you only have limited time, I would recommend going for exotic, as the grind for ascended is a long one.