since you have a bulb there you do have two or three wires feeding electricity to that bulb.
All you need is a new fixture to install. Is this light controlled by a switch either inside or outside?
Switch off the light, and to be sure, flip the breaker for that area.
remove the bulb, pull down the socket, gain access to the wires, free them from the socket, and follow the instructions in the new light fixture box and you are set.
What you will need for this project is:
a six foot ladder, a new fixture, wire cutters, pliers, phillips screw driver, and possibly some electricians tape, that black tape.
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