1. Yes, you had better obtain your landed status first. Alternatively, if you have a job offer, you can apply for a work permit and thereafter your landed status a year later. The issue is it is not easy to find an employer to offer you a job because of the paperwork hassles.
2. Master's degree and work experience in what? That will make a difference.
3.中毒对我来说总是个谜????? Smugglers work in restaurants and supermarkets. I don't think Siemens for example will hire someone without any status.
4.不知道要多久时间语言方面才能大概胜任工作? It depends on an individual's talent in language and the job. If you are a chef, you don't need much English. If you are a psychologist, it will take you years to adjust to the language requirement.