Hi, I want to create a ghost door bell with my students and want it to have two red Led’s that flash when the bell button is pushed as well as the buzzer sounding. It will be a battery powered circuit. Which component types will I need please

 

The "ghost" part of the description makes it a bit confusing, because that requirement is undefined.
Otherwise, the defining item will be the buzzer. What kind of buzzer and what it's voltage and current requirements are will define what sort of battery is selected, as well as how the red LEDs are involved. So more description of the intended arrangement is needed first.

 

Should the LEDs flash at the same time? or alternating flash?
How fast should the LEDs flash?
This can be done with a 555 timer IC and 9v battery (assuming standard 5mm LEDs)

 

There was at one time a source of LEDs that included an internal flasher. Those may still be available

 

There was at one time a source of LEDs that included an internal flasher. Those may still be available

One of those in series with the base of an NPN transistor makes an ultra-low-parts-count relay pulser.

ak

 

One of those in series with the base of an NPN transistor makes an ultra-low-parts-count relay pulser.

ak

One of those in series with another LED and a resistor makes two flashing LEDs. It was not clear if the buzzer should pulse or not.