After you ATPL training, you will have your TR training. Then is base training and line training. These training last months because CX SO only fly long haul. You are a qualified SO only when you complete your line training. Salary is deducted to pay back half of your training fee. SO won't do take off and landing. SOs are required to do it in a sim every few months. After 2-3 years service, you will have chance to promote to JFO. You only have 2 chances in your lifetime. If you failed in 2nd try, sorry you are fired.