Say what job you would like to try in the future.Explain:  -if you'll need a qualification  -where you can get the necessary qualification  -how long it will take you to get the job you want 

In the future I'd like to become a doctor. This profession is noble and always necessary. The qualification I can get only in the university. To become a good specialist I'll need to study at least for 7 years. But actually this professiions' representatives have to study as long as they work.