Your league has now been live for one full round, and you are entering into a continuous loop of rounds. Everything that you do from now on will be the same (over and over again).
Adding new teams
When you add teams from the waiting queue, they are added as unpaid
The players will get a confirmation email that states that, and tells them to pay
You will also see their payment status under Leagues -> Teams/Standings in admin
Waiting queue
Your waiting queue may grow large over time as more teams want to join
The team furthest up are the ones who have waited the longest
You should prioritise to add the top team in the list, but it's up to you to decide what teams you add in before the start of a new round