We're former military. SO moving is part of the package.
At 8 it won't be as traumatic as you think, He is still dependent on you for every thing. By the time they are in high school it is a nightmare. It takes about 2 years to "adjust", become part of the new community and not be the new kid on the block.
Be HAPPY!!!!! THis is the best thing that is happening to your family. You don't think so?? Fake it!! Your energy will rub off on him.
Let him be part of the process, let him see the new house or those you are looking at and ask him which one he likes best. Be excited. Last move my kids were on the internet daily looking at houses. We even went to some of them.
As for packing
Get your house organized. Will you be doing it yourself?
Put all your pictures in one place, all glassware in one place. All wood shelves
It's much easier to wrap all the china together even if it belongs in different rooms than to have special boxes of super fragile from every room.
Rent a storeage unit for a couple months. It will cost about $40-$60 a month. It's easier for me to see what I have to pack when I can get books and holiday out.
Get all the Christmas and storage out of the house and garage.
Use towels to pack around things
Pack books in small boxes
GO to Lowes, grocery stores, office stores and ask for boxes
Look online at Craigslist for boxes of someone who just moved, or freecycle.
Buy paperplates, cups and silverware for the move dates.
Pack the kitchen last, and unpack it first.
Put eveyrhting the kids don't need away, all stuffies, toys--how many trucks need to be out, maybe 2.
Pack dishes on end, not flat.
Get a dolly or rent one from UHaul
Unscrew the legs off the tables and pack quilts around the table tops
Tape all screws and hardware to the underside or in drawers
Buy some newsprint form UHaul, it is cleaner than newspaper and really is a good buy
Startting right now do not buy anything that will last in the pantry for more than a week. Start eating eveyything in the house.
Starting up a kitchen takes about $300. That is if you don't move it.
If you are using a moving company they will not move candles, liquids, fire implements (matches, lighters, flints)
Leave your son in his school for now and make a clean break for 4th grade. THis summer get him involved in some sports in his new community, summer swim team, soccer, baseball.
Do one section at a time, and be excited.
Oh this is a great time to purge what you really don't need or want.