What lvl can I start Campaign?Follow

You can build up points just by doing your daily campaign ops. As far as participation in actual campaign battles, you have a "slight" concession in that area seeing as how you can Cure your fellow Campaigners/NPCs, but you won't really be able to hit anything at 56 (at least as far as I've experienced things). If you want to participate in campaign battles, find a sub that gives you the highest ability to Cure as much HP as possible and just do that over and over.

I think /SCH for Light Arts and MP reduction on Cure spells would be quite nice, and I don't think /SMN or /BRD can offer any amount of MP refresh (Auto Refresh or Ballad) that can match MP saved per cast from /SCH.

/WHM might win out on HP cured per MP if you can join a party and get a lot of good Curaga casts, especially if you can use Divine Seal early and use it again before the battle ends.

From my experience, most melee seem to go as /DNC so they can get xp/notes from damage dealing as well as HP cured.

When I go on my DNC (level 48) I only do N.Gust(S) because, even though I can't hit the campaign mobs, I can grab a Spider from nearby and build TP from that to use for curing NPCs, and in the meantime the NPC healers Cure IV me all that I need to stay alive and not have to dump TP for curing myself.

I think if you go /SCH, focus on curing and have at least a Light Staff for Cures and a Dark Staff (and hopefully more +hMP gear) for resting, you'll find yourself capping Curing XP/notes (I think someone said it was a 500xp cap for Curing) every time you go out there. I come pretty close on my DNC, and I think I'd come closer if I had a faster way to get TP for my Curing. I think with good hMP gear you'll be able to burn all your MP about 5-6 times and reach the cap quite easily.

But seriously, campaign ops are the best source of Notes at your level...I get 800 per day just for running an NPC from the N.Gust(S)/Grauberg border to the Campaign Arbiter in N.Gust(S).

What'd you fix? I see no corrections in your FTFY.

If you're willing to eat sushi you'll be able to hit mobs now. By 60 with Hauby and /DNC ACC bonus you'll be fine. Keep in mind that you won't get the "full" EXP reward until 61, though, when the final tier (although, 76 is reportedly another?) of the level penalty wears off. On the whole, 61 is a great time to start.

That said, with PLD's ability to cure, you can easily do Campaign now (or, at any level, really) just by hanging out near AoE mobs and curing the damage you take. With sushi and /DNC, you could extend your curing as well. You wouldn't be damaging the mobs worth anything, but you'd get the tp. Be prepared to die a lot, which isn't really a bad thing because the penalty for dying is much less than the reward you earn for taking the damage that kills you. RR is a must, though, so you might consider only Campaigning in territories where you have access to your nation's arbiter for free RR and other meds.

Why even suffer the damage and deaths from TAKING AoEs when you can just Cure all the PCs and NPCs instead and get the same reward with less "downtime" from dying?

That does make sense, since the penalty shrunk by 20% every 15 levels. Is 61-75 still the baseline (0.6 > 0.8 > 1.0 > 1.2) or has 76+ set a new baseline with 20% off it in chunks working backwards? I'd imagine the former, but were you paying close enough attention to notice for sure?

Because you get twice the reward from curing damage you take compared to remaining unhurt and curing others. Also, being killed by a very large amount of damage is a giant pile of reward relative to the very small penalty for death. It takes a lot of mp to keep up the 1000-ish points of healing you need to do every minute to cap out your reward, and taking damage is a very easy way to reduce your healing burden.

That said, the goal is to take damage and not die. A 50-something PLD has more than enough hp to be as safe as anyone else near most AoE mobs in Campaign. It's just that death isn't something to be especially afraid of as long as you can get back up again, because you should be banking plenty of reward anyway.