Can my saved game in KotOR be used for anything in KotOR 2?
The second game doesn't follow on directly from the first - most of the characters are different, with some familiar faces and places. So there's little sense in importing a save game, in that respect.
According to this FAQ, there is no way to import a save game from the first game.
edit as for your other question:
The Star Forge was slowly consuming mass and energy from the star, providing the materials for thousands of ships. It also drew upon the darker side of the Force in many ways. more information here