Joy, glad that is helpful!
Roseann - you can just clean up the scan, however, you may end up losing some thin lines. It depends upon how much contrast there is in your document. I like to letter in walnut ink which when scanned doesn't make for a good camera ready. However, sumi ink does.
Also, most printers are savy about what will and won't print well. So they should be able to look at what you submit and tell you if it will print OK.
You can erase some of the dust and noise. There are a few filters which do this automatically. Filter, noise, reduce noise. And also filter, noise, dust & scratches. However, both add a slight blur to the image or scan. You can overcome this by sharpening. Filter, sharpen, unsharp mask. I use the following settings:
Amount: 75-100%
Radius: 1.0 pixels
Threshold: 2 levels
Play around with the filters to see if there is one or the other you like or makes the best impact.
You can also use your eraser tool to erase unless it leaves the white showing through in which case I would use the clone tool. This will keep the same color as the background and go over whatever needs to be erased.
The healing brush and newer spot healing brush work great, too. You just touch where ever you want to erase and it replaces it with the background. Pretty slick!
Let me know if you have questions!