1. Accept the offer officially.
2. If you have any conditional offer (like do this or that before joining the university), complete those formalities.
3. If required, pay the necessary fees to the college/university.
4. Get ready to apply for study permit.
first see that is that only acceptance or fee invoice if acceptance then sign it and send to the college back and then they will send u the unconditional letter then you have to move further means payment of fees and other formalities for filing . like loan and all that
To apply for study permit, you need unconditional offer letter or offer letter with conditions that needs to be full filled over there (like foundation course)