My US visa appointment in Canada

[F1struggle]

Hello All,

I recently changed my employer in STEM and planning to visit Toronto/family next month. My STEM ends in June 2015. I have already applied and received my Canada tourism visa.

Has anyone recently been to Canada for a US visa appointment?

I have the following questions
-What if I change my employer again before leaving, does this change anything on my I-20 or DS-160?
-What documents should I carry? I plan to take my passport, all I-20s and a copy, all EAD cards and a copy, originally used bank statements, current bank statement, letter from employer mentioning when I plan to resume work
-What should my first step be? I would think DS 160 is the first step, and does anyone know the waiting times for visa appointments in Eastern Canada?

Thank you guys.
I look forward to reading responses.

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[DesiOPT-FaceBook-Admin]

Your message was posted as anonymous on Facebook wall- (July 22nd)

[F1struggle]

Sorry, I wasn't clear.

I am going to Toronto for personal work and would therefore need a visa to re enter the states (i don't want to use the AVR) . I do not have a valid visa in my passport. I changed my status from H4 to F1 before my program start date and did not travel outside the country after that.

[DesiOPT-FaceBook-Fan]

To me question is little bit unclear. Why do u want to go to visa interview in F1 stem. Is your visa got expired??