well you CAN plug a mic into that card, through a 3.5mm jack adaptor......but,i dont think the quality wouldbe that great, you need to be able to plug a balanced XLR mic into it to get the best sound, and to bypass recording possible computer noise/feedback...
you need something like>>>
http://www.edirol.com/products/info/ua5.html
that will get the sound from a mic into your computer with the best possible quality (well...not BEST there is always better) , through either a USB cable or a spdif digital out of the preamp/analog-digital convertor and into your computer......
then comes the MIC....mayyybe>>
http://www.studioprojectsusa.com/
in my opinion studio projects give a great bang for the buck, check them out,