Get application form at reception or online, complete it and then hand it in. Should hear back shortly after. If you get invited back you’ll most likely start straight away so dressing smart is a must (black shoes, socks, trousers and shirt - no jeans or trainers). If you get to this stage listen to everything your experienced colleagues have to say, that’s the only way to learn here. Also, try not to break anything and if they like you then they’ll keep you on.