How to create a workflow for particular task and untill complete that task(Approved)

1)create a task(item) in TASKLIST then send email using send mail action

2)once submit the form we create task workflow  send mail to a person

2)click on open this task see the above image it will be redirected to tasklist for approving task

3) untill task complete it wont go for other line in workflow(in 4th line workflow).
4) once approve/reject the outcome column in task list will change as approved/rejected
5) based on that status we need to follow what ever action we need to do,we can.