Very well said, and the easier way to put this would be.
Smoke bomb = Cover.
Flash bomb = Opening to attack.
Smoke bomb is a longer duration, while the flash bomb is instantaneous.
Okay, let's begin with the first jutsu.
Anyhow, you have all your ninja tools ready, no?
-hands you two giant shurikens- Now, like some master genius, try fitting those two together behind one another's shadow and then throwing it -forms Shadow Clone-, at this Shadow Clone besides me one after the other, the first hiding the second.
If he is able to see the second shuriken you've hidden behind the first, then he will defend against both. Try and make sure both is hidden within one another.