If you wish to pursue a career and work in Ontario, it is a question of: “What do you want to be?”
As an international student graduating from at an Ontario secondary school, college, university, or being enrolled in an apprenticeship program, offers many advantages when pursuing work in Canada. If you choose to work in Canada following graduation, it is always advisable to seek advice from the guidance counsellors in secondary schools or the numerous support services available in all universities and colleges.
There are several rules that apply, but importantly, you must have a valid study permit AND apply for a work permit within 90 days of receiving notification from your post-secondary institution that you have met the requirements for graduation or completing your academic program.
Other restrictions are based on the length of time it takes to complete your program of study. If the official length of your educational program was 8 months, then you may be eligible to obtain a work permit for 8 months; but if the program was less than 8 months, then no work permit is available. If the official length of your program was 4 years or longer, you may be eligible to apply for a work permit for up to 3 years. Note that if you wish to pursue employment in the province of Quebec, some different rules apply.
Besides guidance counsellors at the various educational institutions, there are numerous online sources that will provide information about career prospects and demand for labour, as well as resources which provide comprehensive information about levels of salary for specific occupations: