Scanning

When you launch your Scanner Program, first do a Preview then by holding the left click & drag the pointer over the part of the image that you want to scan. Then when you are happy with the selection press scan.
The dpi/Resolution (Dots per square inch)
If you are using the photos to view in your PC only scan at around 100 to 150 dpi. But if you intend to print the images up the dpi to around 200 to 250. There is no point in going any higher as it will take ages to scan and use up loads of unnecessary disk space.
Saving Photos:
If you want to keep the file size down, save your photos in JPEG format.
Normally, when saving photos from a photo package, the default setting is BMP or some other format . Before you save a file, you can name it. Just under where you name it, you will get a list of options. Choose JPEG or (*JPEG). This will keep down your file size a lot. And nearly all photo packages recognize this format.