First, identify which airlines you wish to work for (I suggest CX is not one of them. As a S/O you log P2X - time most, but not all, other operators won't recognise as valid flight time. Beware that most airlines work to a seniority system, so time spent at CX is time wasted). Then asks those airlines if they have a preferred entry path. Some have preferred training schools.
The hardest job to get is your first job. So as the training schools on your short list if they have a policy of hiring their students as instructors. Ask what % are hired. Many schools will promise much but in the end they are just after your $.