Start by sharing the story of Lehi's family leaving Jerusalem, and the various situations that they had to deal with in their journey to the promised land:

- dealing with new living situation and food
- the importance of keeping the scriptures/gospel (brass plates) central to their lives
- new opportunities, drawing closer to God (the Liahona)
- living up to new challenges like building boats or hunting using a hand-crafted bow
- giving up home, riches, friends for something better
- importance of marriage/family relationships (Laban's family)
- not murmuring against parents
- not fighting brothers and sisters

Act various stories out.  Talk about ways to carry these important lessons/symbols with you on your journey; for example, take a set of scriptures with you by hand instead of packing them all in boxes; bring some ready-to-eat treats for the first night in the new house to represent their food in the wilderness; keep a family record of the move (have them record their feelings, draw pictures of the new and old house, etc.); have a meal of milk and honey sandwiches at the new house to represent the "land of milk and honey"; have someone carry a compass to represent the Liahona; think of some favorite Primary songs to sing together when people are feeling crabby and start murmuring; etc.

One thing that was helpful to my son was giving him a disposable camera that he could use to take pictures of all of the rooms, yard, house, etc. in the old place, and the movers and unpacking process at the new place.