So using some super resin polish wont hurt anything, it has virtually or no cut to it and will just fill in any swirl marks, and so will only be worth while doing if the dealer did a rubbish job.
AS for the wax that will certainly be worthwhile as I doubt the dealer used anything that good, it would obviously be better if you didnt already have a layer of wax down to help with the wax bonding, but there is no reason why an extra layer of wax will be a bad thing.