Hi Jason,
I was having similar problems to you as i am also new to astrophotography, here is a thread which will answer all the problems you are having. Including Over exposure, and DSLR settings,which nex image do you have? the Black rectangular version, or the new 5MP version?
http://www.iceinspace.com.au/forum/s...d.php?t=100618
Cheers
James