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Hey Enrique, yeah starting off as basic as setting your camera on a tripod with a remote shutter release is a good way to start off. The best way to understand how to work out the shutter speed is to divide 600 by the focal length using, for example 600/50mm = 12 seconds. But as you have the d300 you will also have to consider it is 1.5 crop sensor which would actually be 8 seconds.
The best way to get the light into the camera is open up your aperture as wide as possible preferably f/2.8 or less. The ISO can range normally between 1600 to 6400 but depending how your camera manages with ISO but it is worth having it high & cleaning it up in Photoshop, by using dark & bias frames.
There are also cheap other ways to get started in astrophotography, you can also buy a Vixen Polarie or a iOptron Skytracker which cost about $600. Both of these are trackers & both easy to setup by aligning up with the celestial pole. Then from there the you can get a EQ6 with a ED80, but with that you need your powertank, autoguider & all you accessories so that gets quiet expensive over $3000.
I hope this helps
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