Please help me, I need to make a circuit

Hi,

I need to make a circuit but I have no clue how.

The idea is that:

A button will be pressed so a tiny engine can be activated to make something spin.

This something will need to stop when it reaches a captor and start again when the button is pressed.

It will run on batteries.

Diodes, leds, transmitter etc is all foreign to me.

Please send me anything you know.

Thanks

Gounette

something like this?
https://en.wikipedia.org/wiki/SR_Flip_Flop#Set-Reset_flip-flops_.28SR_flip-flops.29