How do I create powerups for my game? (visual guides will be helpful)

Hi

This is my first post in this forum…I have a university game project due in next few weeks’ time, I’m suppose to come up with a car…So I’m working on a two player car chase game, I’ve found out that my course instructor likes power ups in a game…so I’ve came up with an idea of three power up

  1. Slow down:.Picking up this power up will slow down the car for around 25-45 seconds…giving the opponent the chance to catch up to them…

  2. Boost: Like the name suggests it will speed up the vehicle for a 25-35 seconds

  3. Invincibility: This one is bit tricky as the name suggest it will make a vehicle completely invincible…but what I want is when a player picks this power up…I want their vehicle to complete invincible except for the tire…so that they may know where their vehicle is headed…but on the opponents’ screen I want it to be completely invincible (not even the tires should show up)

  4. Increase damage: This one is bit different from the rest…what I want here is when a player picks it up…Player will get 5 hits…with a 30% damage hit rate…after 5 hits this power up will die

P.S: Screenshots for blueprints or any sort of visual guide will be helpful…Thanks