Basically the way earning PVP gear works is like this:
Work for the marks in AB/WSG first. Once you have the marks needed for the gear you want, totally whore out to the GRIND experience that is AV. AV marks flow like water since youre there all the time for honor, and you'll soon have 100 with a bunch in the mail. That's when you buy the 60 mark mount, battle standard, tabard to try and mitigate the feeling of futility and shame.
On weekends you want to scope out what the BG of the weekend is. IF its WSG just pretend there isnt a BG of the weekend, cause games last too long for the extra 82 honor you get per match. AB weekends aren't a bad idea, and a good way to deal with the time between AB matches is to AV until and AB match goes. You get the honor up to that point in the game as you leave the match and go to AB iirc and this maximizes your honor gain on an AB weekend. However if your AV queues a lot, it could be best to just AV no matter what weekend it is. AV weekends are the weekends you wanna be around for tho.
HOWEVER, there are battlegroups where AV is fuk busted for Alliance and you guys are leaving with 0-188 honor per LONG game, at which point you may just wanna queue AB. Once you hit 70 you will want to do EotS over AB as the games move a lot faster win or lose and there is more potential honor gain via tower caps.
So in short:
If AV on your battlegroup has crap queue times OR Alliance is being sent home with 0-188 honor, get yer marks in WSG and AV, then queue AB.
If AV on your battlegroup isn't crap, get your marks from AB/WSG, then focus on AV. On an AB battleground weekend, queue AV until an AB pops and you accept the join. On AV weekend, queue AV!
Resto-Druid stand-offs + resilience has killed WSG in terms of honor gain, avoid it at all costs. Get yer marks and get out.
When you hit 70, get your marks from AB/WSG, then focus on AV. On an EotS or AB battleground weekend, queue AV until an AB pops and you accept the join. On AV weekend, queue AV!
Keep in mind battleground weekends only provide an extra 82 honor, but also keep in mind this is rewarded even if you lose. EotS marks are used for level 70 accessories currently.
There's also World PVP in Outlands but I havent dabbled with that much SINCE horde pop on my server sucks so getting a group together is fuck hard, but the equipment rewards are pretty nice. Also keep in mind that WoW can over-estimate your gained honor per day by a full 1/8th sometimes if you pvp a lot in one day, so if youre cutting it close for gear, play a few more matches to make sure you'll get the honor. Also note that honor roll-over happens at 3am server time.
Edit: Come to think of it, over-estimated honor game may be the result of my theory that you still get earned honor from an AV match if you leave halfway through, ill have to ask around. I've been doing things that way for a while tho.