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The exposure for the moon varies depending on the phase.
First quarter at f10 and ISO 200 use 1/125sec, 1/1250sec and 1/500sec.
If you are using a digital camera and not film then you have nothing to lose by trying multiple exposures. Also transfer the images to your PC during takes to check for focus.
Use the mirror lock up feature of your camera to reduce vibration and use a cable release (careful not to tug on the cable release when pressing the button). My Pentax only has mirror lock up if I set a 2 or 10 sec. delay which is good and because of the delay I could get away without a cable release as 10 sec is enough for vibrations to subside.
I do not have live view (and am in search for a right angle magnifying prism). If you have live view you can check for focus with it although checking on the PC gives you a bigger image.
Try different ISO to see what it does to grain/noise. You may be able to use 1/1000 and 1/2000 sec exposures at higher ISO. Do not use anything less than 1/125 and even this is bordering on showing image movement.
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If you have video on your camera use it and stack frames in Registax or other stacking software. I do not have video in my DSLR and for that I use a separate video camera with a much smaller field of view.
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