Here is a detailed video I created to explain how to use a 555 Timer IC, in combination with a few resistors and capacitors, to make an LED light blink.
Things you will need:
2) Breadboard jumper wires
3) 555 Timer IC
4) An LED diode
5) A DC power supply (You can use a few AA batteries depending on the capacitor and resistor combination you used)
6) Some resistors and capacitors based off your calculation
Here is the link to the calculator provided by House of Jeff: