I am in Need of help

I have a lot of questions and I don't want to make multiple forum topics xD 

1. How to spawn particles in a specific position and damage any nearby entities around them.

2.How to spawn particles in order, like I want to spawn a particle in front of the player then after that it will spawn a particle on the side of the player and so on.

3. How to make a player immune to explosions and fall damage when holding a certain item.

4. How to move the player in the direction their looking.

5. How to make a dash attack.

I might do more questions like this in future topics.

I would appreciate the help