Hi Billi
These two eBooks are well worth a read (and I've also been to one of Phil's workshops here in Melbourne - he explains things well and is great with his follow up on questions.)
http://www.philhart.com/tag/night-sky-photography
http://intothenightphoto.blogspot.com.au/
I only bought Royce's eBook today - and on first glance it looks great.
For $20 a throw for each you can't go wrong, and the their info is current 2014 & 2015.
HTH - Paul