I just started a hunter and would like to know which BOA/heirloom gear to get - obviously I have the chest and shoulders - what trinkets, melee weapon and ranged weapon would be best for pve leveling?
Here are some links based on the various hunter specs, which will include all of the BoA items usable by hunters, arranged by "score" based on the scaling factors on the site.
Using the scaling factors available on Wowhead.com for each spec, it looks to me that the following would be the way to go:
You might find additional items that could help out while leveling, but these would be the ones to pick up first.
If you're on a PvP server, or PvP at all, you can pick up the BoA PvP trinket with Stone Keeper's Shards in Wintergrasp.
The mail or leather stuff is great for hunters, the leather not because of scaling but because the hit is awesome, but the mail stuff comes with agi and int so that's your choice really.
For weapons, I'd recommend 2x Balanced Heartseekers (dagger), especially if you're using the mail chest and shoulders. There is also a sword you can use if you prefer, Venerable Dal'rends Sacred Charge. And of course, the Bone Bow.
Hunters start to use mail at level 40.
So you should use [Champion Herod's Shoulder] and [Champion's Deathdealer Breastplate] and not Stained Shadowcraft Tunic/Stained Shadowcraft Spaulders.
Mail heirlooms bought will lower one level of armor type (to Leather) for characters below level 40.