So first you need a PC or Sound Card that does 5.1, even if you have only 4.0 sources, to monitor and preview your source and results.
You will also need a recording interface. There are many stand alone devices that will work. Many members here have equipment like this that is affordable, especially if you can find it used. I use a MOTU unit, but there are others out there.
On your PC, you will need multichannel recording software, like Adobe Audition, Sound Forge, Cyberlink Audio Director to get the audio to a file.
You connect your q8 player to the hardware interface (MOTU, etc), then set the PC to record in the audio from that device. Hopefully your software will allow you to adjust the incoming audio levels.
Once the audio has been recorded into the DAW software, you can save the files to .wav or .flac. Before you do, you can clean them up with noise reduction or eq, depending on how the source files sound. Once you save the files, you have another decision to make.
If you can play a file directly without a format, you're done. If you need a format, like DVD-A or DTS CD, you will need encoding software which is a lot harder to find and a bit more complex to get used to.
So basically the path is Q8 - - - > AUDIO INTERFACE - - > PC/DAW Software - - > Hard Drive
There are TONS of folks here who do this, some rookies, some as good as the professionals. Just ask your questions and people will respond. It's a fun thing to do.
Also, be sure to repair those Q8's before you start. Open them, clean them, replace the pads and splices, and make sure they are not bricked.