While the FSA dictate when official 'friendly' games between clubs can begin, teams are free to get together and have some unofficial catch ups. Running laps on the beach, go for a walk up Mt Lofty with actual pre-season kicking off 6 weeks before official kick-off has also been declared by the FSA.
Juniors should have 2 training sessions per week with Miniroos starting at one or maybe two, totally up to the team staff and the parents.