Always unplug your appliances when they're not in use as they are still consuming energy when they are switched off. It is among the errors made by homeowners so it is best to not do the same and unplug your appliances if you are not making use of them.
Most people do not really pay too much attention on lighting as they believe that your light bulbs are not taking in plenty of energy. Lights can have a large effect on your monthly bills as they can up lots of energy if they're used often. If you have been utilizing incandescent bulbs, substitute them with CFL or LED bulbs immediately.