The other guts of the circuit
There are resistors and capacitors and diodes and such. They serve various purposes, most importantly to provide a nice clean 12V to the IC555 timer chip so it doesn't fry.
I can't share the schematic with you because I got it out of a copyrighted book. Sorry!
HOWEVER, if you are really serious about electronic tomfoolery, here are 2 links to get you going. You can use the web to wire some really groovy stuff!