You dont use anything sweet
Yes. Most of the time, the terms "bittersweet" and "semi-sweet" are used synonymously. Technically, bittersweet does have a higher cacao percentage, but even then the difference shouldn't do much to change a recipe.
Semisweet chocolate has sugar in, unsweetened has no sugar.
about 16
Yes no difference.
When you put the chips in, add sugar.
That is usually done by adding sugar, milk, eggs, and other sweetners.
Yes.
Yes, however the texture and taste will be a little different. Chocolate baking squares are usually unsweetened or a very dark chocolate, while Chocolate Chips are usually semi-sweet or milk chocolate.
unsweetened applesauce
It will be down to personel taste. Try it and report back.
Well it depends on what you are baking but for most recipes, yes you can us Hershey kisses as a substitute. Just remember that they will make your recipe sweeter and that they are a lot bigger than the small semi sweet chocolate chips.
If you do, just be aware that it will not be as sweet and the final result might come out a bit more bitter. Other than that, you usually can substitute them in.