Sound is a bit tricky. You're best off trying to get HDMI to work (the audio jack has some issues). You should first make sure you can get sound out of your Pi. You can try playing a test sound with aplay:
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sudo aplay /usr/share/sounds/alsa/Front_Center.wav
If that doesn't work, you'll have to monkey with your amixer settings to force HDMI:
And if that doesn't work, I believe there's an option in the /boot/config.txt that you may need to enable:
# Force the monitor to HDMI mode so that sound will be sent over HDMI cable
hdmi_drive=2
If you get sound but it's bad quality, you can also try changing the audio driver RetroArch uses by adding this to your retroarch.cfg (where that is I'm not sure; probably /etc/retroarch.cfg):
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audio_out_rate=44100
audio_driver=sdl
The SDL audio driver is slower, but much more stable.