BGs at 69 is still easy. Don't worry about resilience until you are 85, so save honor points till then as well, you will need about 20k to buy a basic set to enter Arena, but the cap is 4000, so if you are at 2400 start buying pieces for level 85, so that once you hit that level you have some gear already.
1. Use a PvP based spec
2. Learn how to counter other classes' abilities, as a pally not much you have to do, but CC'ing a healer or killing a healer 1st is usually prio
3. Most BGs its actually more important to go for objectives than killing players. Killing players give honor points, but going for objectives and win gives faster and more honor for time spent.
4. Communicate with other players in the BG, its essential if you plan on winning, and try to be nice to other players even though most of them won't try to be nice.
Short strats for most BGs.
Alterac Valley
Best most efficient win here is go for bunkers/towers then kill the opposing faction leader. The semi hero can be killed but if you waste time on him/her you could very well lose, only aim for that if you know you be losing.
Warsong Gulch/Twin Peaks
3 fast caps is the win, defense also helps except on the 1st cap right after the game start. Mid fight is a waste of time unless everyone works as a team to control midfield and make sure the opposing faction can't cross whilst helping your own flag carrier. Slowing FC attackers is key so that your own FC can get away from attackers. Slow EFC so that your team can keep pressure on him while dealing with his healers.
Arathi Basin/Battle for Gilneas
Get 2/3 bases (AB 3 bases, and BfG 2 bases), AND VERY IMPORTANT, DEFEND! So many times I see us getting the bases just to lose them because there are no defense.
Eye of the Storm
Get 2 bases, defend and take flag.
Or get 3-4 bases and ignore flag, though the 1st tactic is the easier one, it however fully depends on what the players actually do and don't do.
Again DEFENSE is key to win.
Strand of the Ancients
Control of the tanks are key here.
When you defend, slow them, keep them slowed and prio is to kill the tanks.
When you attack, key is to break through as fast as possible and take control, this is best done like this.
Melee steer and control the vehicle.
2 ranged stand on sides, 1 caster with CC that CC all the attackers behind the vehicle, and other caster preferably a healer, which dispel cc on the vehicle as well as heal here and there, but mostly dispel cc on the vehicle and partly heal the players thats attacking the vehicle attackers.
The last one I am not going to bother to describe since its a **** BG in my opinion and I never play it.