power up/ faster/ slower for a set time and revert

Can anyone help me or direct me on the right tutorial?,

1.Scene is a player eat a power up he becomes bigger/faster can destroy objects then revert back on a set time (seconds). after he can be killed by monster on collision again.

2. Also player eats a power up changes the background layout color but still on the same tile.

Can anyone direct me on the right place, I'm reading some tuts but its not close by to what I'm looking.

give the player timer behaviour.

on collision with powerup

-destroy powerup

• player start timer 5 seconds
• player set scale to 1.5

player on timer

• player set scale to 1

thanks LittleStain, I manage to set the timer with the countdown example, just need change background color? on the layout, every time a player hits a powerup. background changes color for aesthetic purposes.