At the early levels, mana is much more of a problem than it is later on. Keep two stacks of water on you when you run instances, and get as much "of the eagle" mail stuff as you can. Once you get blessing of sanctuary, your issues will diminish, but probably the hardest part of prot paladin levelling is keeping your mana up.
If you can find a mage that plays at the same time as you, you'll save a fair amount of silver.
Just make sure righteous fury is up, use seal of righteousness until you get seal of vengeance, and go to town. Enjoy as many of the early instances as you can. Deadmines is a must, but Black Fathom Deeps and Wailing Caverns are really fun as well (wailing caverns is the first dungeon you should be doing, at level 18 or so). The 5 mans at level 80 are very short, and the vanilla 5 mans feel epic by comparison. Don't rush past them if you can help it.
I may have missed some patch notes that had Paladin rez as trainable, but just in case, don't forget about your class quests that reward you with the resurrection spell, and also the kick ass hammer quest.
Here's a spec that will take you to Blessing of Sanctuary at level 20/21.
http://www.worldofwarcraft.com/info/classes/paladin/talents.html
One note about Blessing of Kings. It's going to be a base spell for all Paladins (probably) in patch 3.1. For the early levels, 10% of nothing is nothing, and you are better off using Might, Wisdom, or Santuary (when you get it) in pretty much any situation. Certainly your hunter friend will benefit more from might, and your druid friend more from wisdom. I would skip Kings until you get Sanctuary, then back fill into it if you wish.
_________________