Okay, then that REW software site I pointed you at is a good start, download that and dive into their materials and forum. This thread is a
good tutorial on using REW with a usb mic; for usb mics a miniDSP Umik-1 or a Dayton UMM-6 would be good mics to get. You will be limited to the adjustments via your on board eq, rather than implement something with something like a miniDSP 2x4 or similar unit.