I have applied to 3 different clubs that appear to be “active”. How will I be notified?

Presidents and officers do not get notifications that there are players waiting to get approved, so they may not look in their in-box. Best is to contact them outside the game, i.e. FB, for clear communication and understanding. Once you get in, I believe you receive a pop-up window as soon as you enter the game, so it will be obvious. After a day or 2 of no response, I'd try elsewhere. There are listings of clubs actively seeking players in the FB Detective Lounge Discussion Group and Club Callout in the JJ app page.