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Tammy,
the crayford 10:1 is a dual focuser.You can use the outer knob to make very fine adjustments to focus which is usually what you need for planets.It is very useful to write down your settings as you learn.You can use a regular moon filter that makes the moon look green especially if the moon is really bright or you can use a red filter.
I like to keep the gain as low as possible and adjust the brightness.Remember gain=grain-The higher the gain the grainier the image.
I would no use a barlow yet.It is harder to focus with a barlow and the image will be dimmer.
Once you are ready to use a barlow i would suggest getting a flip mirror.What this does is allow you to use an eyepiece to get the image of the planet centered in the field of view and then you flip the mirror to direct the image to the camera.I will take a pic of my imaging train.If you are using a Dob you may have to adjust the balance of the scope to accomodate the weight of the imaging train.
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