Best option:
Have the printer flushed by a service tech, leaving shipping fluid in the lines and the head. Cover the printer and leave it in a temperature and humidity stable environment.
Other option:
We actually often leave printers in the office for 6-8 weeks at a time without printing, because we're using other machines or whatever reason. A quick nozzle check and cleaning has been all that's ever needed to get them back. However, we keep them very clean and don't let dust or fibres build up in the capping area and such. If "into storage" means no temperature or humidity control, then it becomes more of an issue, particularly if the printer will experience either outside the recommended extremes (refer to the User Guide), because extreme cold or heat can (will) affect the ink.
With either option, make sure you run a nozzle check and ensure that there are no blockages - even do a light clean even if not required just to ensure the head is nice and clean.