How to create and copy a task with subtasks?

Question

JIRA

The guys have a couple of questions on jira
1. I make tasks with subtasks of 15 points in the template. Because Since the tasks are quite of the same type, I would like to just copy this template for a new task, how can this be done. In Trello, this is implemented quite simply.
2. How to set up notifications that a task has been assigned to you in telegrams?
3. How to set up so that under certain task statuses, notifications come only to certain people?
4. How to mono automate the sprint template so that the task itself passes to another participant after some actions. For example, I completed the task, set the status to ready and the task was transferred to another person automatically, he finished performing and she immediately went to the third.