Hi Geoff,
I also am learning so the only advice I can offer is to go to this site as a start as Eric Lowe? post the most amazing photos in Iceinspace under the banner EzyStyles and on his web site he has tutorials that show how he basically processes using photoshop CS2 but a lot of steps are the same. Web site is
http://www.ezystyles.com.au/
Good luck. I hope to see some of your images soon
Mark