Captains will select their teams at the start of the season but some movement between teams can occur throughout the season. Juniors are often selected to play for our senior teams (minimum age is 13) and we even have players in our top teams who are 15 years old.

We do not need players to be available every single week but it helps if your captain is given your availability as far in advance as possible.
It is also preferable for players in higher teams to attend training on a regular basis.