I know there's a lot of tutorials but most differ and I was wondering if anyone here has done this already?

If I buy a 2x RCA male to 3.5mm female adaptor, do I still need to use the composite cable or is that all I need.

My headset is analog with just the two 3.5mm jacks. This is why the different tutorials are confusing. I presume the USB dongle is needed for the USB headsets only?