I bought a usb microphone and how do I listen to my self I'm running Windows visa
The first thing that you should do is to switch to INST/MIC and MONO. This function allows the computer to mix sound from the computer playback with a live performance sound without interference or echoes. Next, record yourself and then set audacity preferences. Visit http://wiki.audacityteam.org/wiki/Overdubbing_with_a_Samson%C2%AE_G-Track_USB_Microphone for more information.
I recommend you upgrade for starters.