How much baking powder or soda would you use per cup of regular flour?[/quote]
For each cup of all-purpose flour, add 1 1/2 teaspoons of baking powder and 1/2 teaspoon of salt. You can reduce the salt from other that may be in recipe. Whole wheat is heavy by nature, so you may want to try that proportion first, then adjust up if not rising well. With whole wheat, using honey instead of sugar seems to make moister, too.