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Peter,
I would highly recommend "Astronomical Spectroscopy for Amateurs" - it covers all of the key material, and you don't need to have a PhD in Astrophysics to understand it all! It's available as an eBook download from all the usual sources, so you can start reading tonight.
If budget is an issue (and let's face it - it always is!), you might want to look at acquiring a Star Analyser 100 filter. You can buy one for about $200, and it will work with a webcam or DSLR. While it can't produce the resolution of more sophisticated instruments, it will give you the ability to capture some useful spectral images of the brighter stars the very first night that you fit it to your telescope or camera, even if you don't have a tracking mount.
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