The serial number is located where the fork goes into the frame. I don't know what kind of frame it is. I want to say it is a bmx frame but I am not sure. It had 20" plastic wheels and a plastic seat. Does that help at all?
still need to see a pic of it my friend. if the id numbers are on the headtube that would eliminate a few and would lead me towards a schwinn but there were others that did that as well.