I highly recommend picking up a good book on the basics of astrophotography to get yourself started:
http://shop.iceinspace.com.au/shop/s...g-stars-ebook/
http://www.astropix.com/GADC/TOC.HTM
(I receive no benefit from spruiking either - but I'm a happy customer of the first one.)
Here's some free but good material to get started too:
http://starizona.com/acb/ccd/ccd.aspx