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).