Urgent help !!!!

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Hi,
I need assistance for the following ,
I am Kenyan Passport holder i was visiting my family in canada on a visiting visa. i was offered a job after an interview in a company due to process, i extended my stay. i got a reply from Buffalo and i have to go for an interview now,  i have already applied for an extension of the visa but i havent recieved any reply and it is almost 2 months now. My visa is almost expiring now. anyone knows how long it takes for them to reply about extension process.

Secondly, what do i need to process my US visa to enter Buffalo because i am a non-Canadian resident.

Thirdly, do i need a re-entry visa to enter Canada because i have been told i need a re-entry visa to show at the US consolate while obtaining the US visa to show that i am going to come back to Canada again. what is the procedure.

Please help me for this. Your reply will be appreciated
thanks in advance.