Light switches
Think carefully about the location of switches. If you put four or five next to each other, people may be confused about which switch controls which light. Where possible, position switches near their lights.
Be sure that you can turn on lights easily, no matter which door or entryway you use. Often the most convenient arrangement is to use three-way switches so that a single light or series of light can be controlled by two different switches.
The lights in a kitchen typically are on a single 15-amp circuit.
Receptacles
Codes often require that a refrigerator receptacle be on a separate circuit because a blown circuit breaker or fuse could lead to food spoiling. A microwave oven may need its own circuit too, depending on its size and power.
Most codes require two circuits for countertop receptacles. In some areas the receptacles must be ground fault circuits and must be on 20-amp alternating circuits. In other areas the required arrangement is to have two 15-amp circuits with non-GFCI receptacles wired with split circuits so the two plugs are connected to two different circuits. Check local codes.