Well, that depends on your definition of "guidance".

think of your project as a combination of smaller projects as below:

1) how will your microcontroller see that the switch changed state?
2) how can your microcontroller switch on a LED?
3) how can your microcontroller make the buzzer sound?

try each thing separately. If you can do each step successfully, then take a step further and combine the three.

You also should get familiar with the structure of the 805x (if not already). Check the tutorials on this web site.

regards
Patrick