Determine all areas that need to be packed up, including offices, workstations and common areas (copy rooms, lunchrooms, closets, file rooms, storage rooms).  Most staff prefer to pack up their own offices and workstations so encourage them to start early (up to 2 weeks prior) by having boxes, labels and other packing supplies delivered on site.  Floor plans of the new office will typically include a numbering system that you can use for moving purposes.  Plan to purge and pack one common area per week and bring in extra support if needed as most moving companies offer assistance with the packing of common areas.  Ensure everything is packed into moving boxes or plastic bins and labeled to the new location.  Anything that does not fit in a box can just be labeled directly.