I didn't read this whole thing so I'm not sure if this was said or not, but you can see the level requirements for at least the first golden card in game. To do this you must open the crafting page, then click both "Show Golden Cards" and "Show Soul Bound Cards", then right click a card as if you were going to craft it. It should then show you the class and level requirement for the card in place of the normal "Disenchant" and "Create" icons. This only works for cards you do NOT have already.
Also, the listed (in game) Arcane Shot is wrong; it says it's level 24 but I'm pretty sure it's level 36/38. I know this because I'm level 29, I don't have it, and there is no other card listed at 36 to fill in the spot.
I just got to 30 and now when I hover over my hunter, it tells me my next card is Arcane Shot at level 32. The crafting book, on the other hand, says I get Multi Shot at 32. So take the crafting book with a grain a salt.
That is the first northshire cleric. The second one is presumably on level 42 (like the pattern suggests). Shadow word pain is before that. Other than that, my memory is cloudy and I cannot recollect when the others are.
The ones I have accumulated thus far would be:
holy smite mind vision power word: shield mind blast divine spirit shadow word: pain
I believe the order is this: mind blast, power word: shield, holy smite, divine spirit, mind vision, shadow word: pain, northshire cleric.
This is the second humility. The other one is at level 28.