Good question. Some affiliates make themself a Team Leader but they don`t have established team. My opinion is that they should form a team of people who will be active every month and bring new active members. Number of people in a team depends on your goals. Only when you establish your team then needs to become a leader. Make sure that all of yours PSAs becomes EA2. If you are sure you have a good and reliable team become a Bronze Team Leader. Then you can progress to Platium Team Leader.