Crusader's Strike is going to be baseline
Holy Shock can still be used offensively
Judgements arent going anywhere
Shield of the Righteous is staying put
Consecration will still be around
Exorcism? yep, thats staying too
Hand of the Righteous can be used to pull, and will deal a decent amount of damage too.
did i miss anything?
That'll be more than enough for leveling purposes if you really want to level holy.
Leveling as a healer is pretty much the same as every class... you'll kill everything pretty slowly, but you're probably not going to die unless you do something stupid.