Whether you are adding a room or rewiring an old one, don't skimp on the receptacles. Aside from it being dangerous to overload outlets with extension cords and adapters, it can be just plain frustrating to have dark corners where you most need the light. In this way, 6' cord on an appliance or lamp can always reach an outlet without an extension cord. Again, this may be determined by local code. If there are two entrances to the room, plan for a light switch at both doors.
Place switches on the unhinged side of the door.
Determine the most direct route for fixtures, and route them accordingly. Draw a rough floor plan and note the location of all receptacles, switches, and fixtures. Such a plan will assist you in making up your materials list and in calculating the amount of cable you will need. While it is easy to make mistakes when working with electricity, it is just as easy to avoid them. The single most important mistake to avoid is neglecting to turn off the power before beginning.