I'm in Canada too and I sent my pics to several agencies in Canada (Mode, Next, Elmer Olsen, and some others) and the U.S. (Women, New York Models, IMG, DNA, Marilyn, and I think a couple of others). I only sent my pics to major NY agencies. That way, if a NY agency is interested, I can skip the step of dealing with a Canadian agency, but if none are, I can model a bit in Canada and get placed in NY/Europe through my Canadian agency.
Most agencies don't say you need parental consent to send pics except for Elite. But, take my advice, tell them before you do it! Gah. I didn't and I still haven't and now I have a few agencies interested in me and they don't even know I sent out any pics or want to model at all and now it's hard to find a way to tell them without thinking of them being mad that I did it without telling them. I'm waiting for the right agency to be very interested in me now before I say anything because I'd hate to say something and then not be able to even get a decent agency. I'm thinking it would definetely have been best to let them know from the start.