ok so now it's time to build your controller. You can try Radio Shack or your local electronics store for parts but if you don't have a store nearby, you can order the components from
www.allelectronics.com
From top to bottom:
(C2) 1uF electrolytic cap (polarized.. but it wouldn't matter)
(IC1) 555 timer IC + socket (easier to solder)
(R1) 1KΩ resistor
(C3) .1 uF ceramic cap
(R2) 20KΩ resistor
(C1) .47uF capacitor
(P1) 500kΩ pot
If you can't find the exact values in the store, you can always buy one that is
similar or close to the value of the original. For example, if you can't find a 1KΩ resistor, you can always substitute a 980 Ω in its place.
For a really neat and professional project, you should also consider getting an enclosure and a circuit board for it. I have a huge blank circuitboard that I just cut into many smaller pieces.
If you are not familiar with electronics or just starting out, it's best to use a
breadboard to prototype your circuit so you can alter the wiring easily without de-soldering the components.