godundastandzme

Hello, I just downloaded imgburn and I read through the guides, but still have no idea how to make a DVD. I downloaded some movies of the internet, and when I try to open them with imgburn in says the file type is not supported. They are avi files I believe. I also dont know what the difference is between double layer and single layer like is mentioned in the guides. I hope some one can help me as I would really like to learn how to use this product. Thanks