You definitely want VIT, also I will defer to someone else to tell you which of the stats grants you a bonus to healing magic, but you want that one.
Also I suggest you only really think about starting to adventure as a Paladin after level 35 when you get Divine Veil given how at a low level Cover is pretty useless, as it is when soloing, however Divine Veil will be almost your bread and butter.
That said, do not be afraid of going the path of the sultansworn, the talk about PLD x WAR is extremely heated and while I only have minor experience with Paladin, the general trend on these forums is that a Paladin can tank effectively, but it requires a degree of skill, and also that people are 'used' to Warrior being superior but- Sincerely if a PUG is going to kick you for going with a Paladin instead of Warrior then I wouldn't go with them in first place.