I'm currently a student in Canada, and I just got a positive LMO to work full time in a company.
What's is the next step? How do I get my work permit??
Thanks.

You must seek the Canadian work permit itself via a visa office outside of the county, or at a port of entry if you are passport-visa exempt based on nationality. If the work is in the province of Quebec, you would need to seek a CAQ from its immigration officials prior to this step.