The additives are typically Calcium Chloride, Calcium Sulfate, occasionally Magnesium (consider Epsom Salts), and then pH adjustment by Lactic Acid, Phosphoric Acid, in the strike water based on the mash, or Acidulated Malt as part of the grist in the mash. You will need a good set of starting numbers to work from, so your Ward Lab report will be used for that. Then a good water calculator - Brunwater is available in both free and pay software. Other software is out that as part of a recipe builder and are pretty reliable.
For pale beers, you might use under a gram or so per gallon in the strike water/mash of both CaCl2 and CaSO4. Also consider Brew Tan B, though it is negligible in amount needed for a 5 gallon batch (it is a gallotannin that helps in many different ways, including clarity of the final beer).
Cheers.