Reply to Need Help With Soundcards!

Hey there everybody.
I have been looking through all of the new threads but can't seem to find one that i'm looking for..

The situation is that i have just pre-ordered my vci 100se. I have never had any DJ experience with gear before, but i want to work from the bottom to the top.
I don't fully understand how inputs and outputs work, so i was kind of hoping that some of you guys out there would offer out a bit of advice and a few tips on picking a soundcard.
I will use the internal soundcard in my vci 100se, i'm going to get TRKTR Pro and i already have a Micro Hi-FI System that i can use for home use.

How would i connect my HI-FI system up?
-It has Left and right LINE out
-It has left and right AUX in

I'm in need of help guys cause i'm really a newbie to all this stuff.
Thankyou everybody who contributes, I'll be sure to reply to any posts.

NewBoy, Peace