Let's all take a moment to thank the op for even asking. Rather than going into wz with low expertise and shrug at anyone trying to explain bolster.
I usually start out getting 2K dark/light and some relics @20 lvls.
Then sit back and do some low profile objectives in afew wz to make the intro quests for wz.
Should earn you about enough comms to buy two implants from pvp vendor in Capitol city ( lvl 20 req).
Also if I haven't gotten am earpiece by then, buy that from same vendor. They all cost 310 wz comms each.
Basically fill all slots to max expertise.
Regarding pvp closer to 60, you should check out the post about min maxing expertise. As you wil be nerfed in expertise with too high lvl items.
I'm working on the perfect combination and hope to post some time later. But for now I recommend spending basic comms on blue/greens as they seem to get best bolster.
And allso use endurance crystals. More hp tends to decrease aggro in pvp :-)