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what can i buy off the shelf from R.S.
to build an electronic timer

i want to activate a timer with a simple push swith, intially this timer runs to twelve minutes and when it counts down to the two minute mark I need an audio beeper to come on for ten seconds,then at the last two seconds prior to shutting down, I need a six volt output to run a relay. also in the timing sequence when it comes to the two minute mark and the audio beeper comes on and if you activate the switch, you get the timer this time to go to six minutes, and when the timer gets down to the two minute mark again it gives an audio beeper for ten seconds. are there components to build this
at radio shack? thanks Chris