Using slabs of concrete to create a drive-what do I need to do for prep?

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We got a large load of concrete slabs that were headed for the landfill.. They were 2nd & 3rd story walkways that were cut off the side of a building and basically look like sidewalks all piled up....they range in length from 12' to 18' and are 27" wide...our idea was to use them to create a drive where we have only sand/dirt. Other than leveling the surface first, what do I need to do to make sure they don't move and shift after getting them in place?
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