I also cannot tell you how much sugar to add. I would start by adding about pound of sugar boiled in about 2 cups of water. You can add more later if you would like. The point here is to add a little at a time, taste the wine, then add more if you feel it is not enough. Experience has taught me that it is best to have more than yourself tasting for sweetness.
Patience is valuable here.
Let your wine set in a quiet place to clarify. This may take a few weeks, to a few months. Time is your friend here. Just keep the wine out of direct sunlight, and keep oxygen contact to a minimum. This is up to you, as it is a compromise.