need help with alarm circuit [toggle output]

wozzzzza

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been out of electronics too long and ant work this one out now.
i want to build a circuit, an alarm circuit, that will toggle armed and unarmed with 2 separate high inputs, e.g. one input goes high for half a second to turn it on and another input goes high for half a second that turns it off. no matter how many times a high pulse is sent to the on input, the alarm will remain armed and vica versa.
another n/c input to trigger the alarm out for 5 seconds, so when this input is open circuit it will trigger the alarm output for 5 seconds only when the circuit is armed. after 5 seconds waits for another alarm input.
how can i build something like this easily??

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if i get just the ATMEGA328P chip and crystal and few other components, if i use the Arduino Nano as ISP programmer like i do for the attiny85 can i also program the ATMEGA328P on a breadboard with that? with the crystal and capacitor and whatever, will that work?
 




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