Protools LE won;t output into 5.1, you'll need HD for that.
Logic/DP4/Abelton and even Soundtrack Pro all output to 5.1 but not LE, oh no, that would be farrrrrr tooooo much to hope for wouldn't it Digi?
As for connections, either go analog direct into the Stereo LR inputs, or use the optical buss (which I think the 002 supports).