What are the required documents / info to get a B permit ?

Hi there ;) !

I have a few questions about what the required documents / info to get a B permit are...

From what I've read somewhere, I can obtain the B permit by myself within the first week of my arrival at local authorities ("Gemeinde Einwohnerkontrolle") from my residential area. I indeed need a copy of my passport, my work contract and a passport photo for that.

My question is : do I need to give them a residential address ?
If yes, should I first register my address to the local autorities ?

I ask these questions because I am in Zurich next week to search an apartment, so I do not yet have an address in Zurich, but my future employer wants me to send him my B permit as soon as possible. So I wondered if I could get it next week even w/o an address ?

And my last question is : where to go to get the B permit. Should I go to the Migrationsamt des Kantons Zürich (Berninastrasse 45 | Postfach | 8090 Zürich | http://ift.tt/1N86DcL) or to the Amt für Wirtschaft und Arbeit (AWA) (Walchestrasse 19 | Postfach | 8090 Zürich | http://ift.tt/1N86DcO) to get it ?

Thank you very much in advance for your help ! This forum is very helpful !

Cheers,
Loïc

What are the required documents / info to get a B permit ?