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get an external audio interface, a real mic, and monitors. you can deal without the monitors to start, but you'll soon find that what you learn about interacting frequencies necessitates them, particularly in the realm of making electronic music. an external audio interface will expand your I/O options, give you a couple physical knobs to give you quick control of your environment, and also take the task of handling audio off your computer via the soundcard inside the unit. you'll find audio production is extremely tasking on your CPU and you'll benefit greatly by compartmentalizing the tasks your computer has to perform. usb mics are okay. they're really convenient. but if you get a real mic, perhaps with phantom power, your audio quality will be so much more natural and easier to work with. but take your time. you'll learn what you're after to a better degree as you experience the world of it. you will eventually be spending thousands and thousands of dollars, as pro hardware is not cheap. but you can start with pretty cheap stuff if only to familiarize yourself with the process and potential.

hope that helps.