First for free will. As you may know, Love is the center of Christianity. God's love for his creation, man's love for his fellow man and God, yada, yada, yada...
However, love (the benevolent concern for the well being of another) is a choice. As I stated before, God's impetus (or driving force) in creation is love. As such, he desires that we return that love. In order for that love to be returned, we must have to ability to choose to give it. If God had created man without free will, there would obviously be no evil, but we'd be mindless drones, shallowly praising and singing to God's greatness. Such a creation would be little more than an ego stroke for a vain god. The fact is, perfect love demanded that the creation be able to return that love. Indeed many who claim Christianity do not understand this and belive that they themselves (and in some extreme cases God himself) do not have free will. I'll tell you this, just because it's debated, doesn't mean it's debateable!
As for all actions being good or bad, that's precisely what I'm saying. You are right that there are consequences to every action. However, an act is necessarilly good or bad. Intent and circumstance affect the culpability (or responsibility for the act) but the act in and of itself remains either right or wrong.
For example, in a case of self defense where lethal force is necessary, the act of taking the life is stilll wrong, but the responsibility lies with the criminal who was killed and not the person who acted in self defense. Effectively, the criminal is responsible for his own murder.
Finally, If you think that evil is not an absense of good, I'm not offended. You can think thatever you like. I'm simply delivering the understandings that support the faith that you reject.