homecenterjob

I am 14 and am making a few thousand online. When do I have to file taxes? I am making the majority off of CPA networks doing PPC marketing which means about 75% of my income are advertising expenses that I use to buy clicks off of Google Adwords, do I still have to pay taxes on that too?

So we are going to be working with CPA networks obviously, but the problem is, since I am from the United States and he is from Canada, how are we going to file taxes?

Any suggestions would be great.

Thanks,
Matt G