If you did not set up find my ipod, then you cannot track it at all. Sorry.
"ow can i also find out my serial number because i dont remember it? "
A simple google search will find:
"Another thing is that whoever stole it tried to download apps on it but doesnt know my apple password and so itunes has been sending me emails if i forgot my password and stuff, is that something that can help me find my itouch back?"