1. What kind of substrate do you have and how thick is it? How long has it been in your tank? If it is only a couple of inches worth of substate and fairly new then I wouldn't worry about taking it out. If it is thicker or older you may want to remove it so you can protect the tank. If it is old, you may want to consider replacing it if it is sand or sift through it to remove the gunk if it is
crushed coral. Either way, I would try to seperate the top 1-2 inches from the rest and reuse it on the top of the new/cleaned substate. Remove as much water as you can before messing with the substate.
2. Rubbermaid containers like mtfatwork suggested works the best for transfering rock and livestock. Put your fish and rock in seperate containers so you don't smash the fish while moving stuff around.
3. Since the water actually only has a small amount of bacteria in it compared to the substrate, rock, tank, equipment, ... it is not critical to transfer all the water as long as the new water has similar properties to the existing tank water. New SW will probably have a higher pH than you tank's current pH level and different trace elements in it so your fish might become more stresed out with the move. Since your move is not very far, it might be possible to get some water transfered over to your new place ahead of time with a heater and powerhead in it so you don't need to worry about transfering the water on the day of the move.
4. When replacing the water into the tank at it's new location, dump the water slowly onto either a plate or your rock using a 32oz cup until the water level is several inches deep will help with keeping your water from clouding.
5. Although while moving your tank may seem like a good time to clean it, I would recommend not to clean it as your equipment has bacteria on it that will help to make sure that you don't get ammonia/nitrite spikes.
6. Once you get your livestock to your new place, put a heater and powerhead in the container with the fish and then you won't have to worry about getting everything setup as quickly. I have heard of people keeping their livestock in a rubbermaid container for a week after a move while getting their new system setup, but I wouldn't recommend it.
7. Have Fun
