i have checked the rule book and Q&A lots of time, but i cant sure these question.

According to the rule book, the steps of Attack must follow the order,
1. Declare Attack
2. Avoid Attack
3. Roll Dice
4. Damage and Effects
5. Additional Strikes
6. Damage Barrier
7. Counterstrike
8. Attack Ends

and my questions are,

1. in the step 4, if my roll damage can kill the enemy creature, it will die immediately? or killed after the attack ends?

2. if the creature is killed after the attack ends, it means the creature can make a counterstrike?

3. the effects will happen immediately after rolling? if yes, the stunned creature can't make the counterstrike?

4. is the Daze effect the counterstrike action?

5. according the rule, sweep is a new attack action.
    so, if the creature is stunned in the counterstrike step, can it make the sweep action?

6. if the creature is stunned by the counterstrike action, can i remove the stun effect after the attack end , because the creature has end of it action phase?