Explode blocks

heey heey developers,

I've got a question. I'm not sure if i'm in the right section, but please keep on reading.
I'm making a plugin where you can use abilities, one of those abilities is that there will be launched a "meteor" out of the air and when it hits the ground it should explode. The thing that i want is is that when it explodes blocks will fly away and the exploded blocks will be regenerated after 4 seconds. Can someone please write this piece of code, or just explain how i should do it step-by-step?

 

Here's a step-by-step guide

• Make a list/map that holds the Block instance
• Launch sand blocks with the ID of each block (their .getdata() and getType())
  
• Put all the blocks with their location into the map/list.
• set up a delayed task, that after ___ time, do the following.
• -- loop through the list/map.
• set the block to the map/list instance of the block
• clear the map/list