Typically the prosecutor's office will call you in advance of the trial to confirm your availability and to schedule an interview time. Depending on the nature of your evidence and the seriousness of the case, your interview with the Crown will take place in the weeks leading up to the trial date, or even the morning of trial.
When the trial begins, you may be able to sit in the courtroom unless the court makes an order excluding witnesses, in which case you will be asked to sit outside the courtroom and will have to wait until you are paged.
You do not need to be present every day of the trial. You only need to show up for the date requested. Your subpoena may indicate that you need to attend every day, but the Crown will tell you when exactly they need you. Once you have testified and have been cross examined by defence counsel, that's it: you're done. Although if you've already got the day off work you could remain to watch the rest of the trial day (unless, again, there's an order excluding witnesses).
Also, be aware that defence counsel may call you and ask some questions. This is normal - there is a legal principle that "there is no property in a witness" - i.e., you aren't the "Crown's witness" and either side can try to talk to you.
Good luck. It should be an interesting experience.
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