Ok, do I need to add any supplements to the water?
I use the lfs saltwater for water changes, so I don't know if it is any good or not, I top off with ro/di.
Also is it a good idea to use coral dip before I put the corals into my tank?
I would hold on the supplements. Never add anything you can't test for. Coral dip is a good precaution, but I don't do it as I don't want to stress the coral any more than necessary. That's just my opinion. I will dip a coral if it shows signs of parasites.