Before you start packing your belongings, it is a good idea to wipe everything down. It may seem silly and a waste of time, but there is nothing worse than finding surprises in your boxes when you open them. If your boxes sit in storage for even a couple of days, then they will be susceptible to rodents hanging looking for anything that smells like food. You may also get a nasty smell in a box if something you neglected to wipe down goes bad. Also its a great idea to wipe down things from outside in case there is a bug's nest in your things. Nothing is more unpleasant than to find a family of spiders in your box.
There is also a list of things that are not wise to pack:
Anything in a pressurized can (shaving cream, hair spray, ect.)
Foods that aren't factory sealed or will go bad
Also don't forget to empty out gasoline from small engines (lawn mower, gas powered tools, ect.), and if you have a scuba tank take it to a dive shop to release some of the pressure.
The big fear is if things expand or contract due to extreme temperatures.
These are just some basic guidelines to follow, if there is any question about if or how to move something contact your movers or local moving store like U-haul.