At this stage I have 4 PSAs who are Team Leaders.
I helped them by showing them the exact steps I took to become a team leader:
Make sure you have a SO for at least 1500 VP. Complete the Getting Started actions. Do the Daily/Weekly/MonthlyActions and get all the VPs you can, ALWAYS!
Play games and take part in auctions.
They trusted me and followed.
Result : We've all been team leaders for the last 7 months!