I know from my friends who are TFW's that first the employer has to apply for an LMO to Service Canada. First he may have to meet some requirements like advertising the job so he can say that nobody applied. He also has to be offering market wage. He can apply for an LMO for a specific person or he can apply for an open LMO, 1 or more, without having specific people he wants to hire. When he gets the LMO he will give it to you and you use it to apply for a work permit. If you are from a visa exempt country, you can drive to the border and do it there.