If you wants to connect audio interface to music sound or dj mixer and mixer to sound card so this video for you.
You can connect your mixer from your sound card so for this connection you will need...
1. XLR cable male to female
2. TRS cable with 6.35mm stereo jack ( male to male )
3. Before this setup you have to keep the connection of your sound card to your computer ready and also keep the connection of the speaker ready.
Follow this video and understand the connection....