Bought this saw second hand with no manual...Starts up and runs well, cuts well, got it cheap, blah blah blah...but I need some knowledge from someone who knows this saw or can tell me where to find some info... --What fuel mixture do I use? --About how old is this saw? --How much is this saw worth? --Where does this "rank" on the "totum pole" of chainsaws? Obviously it's not a Stihl, but...??? --Where can I find a manual for this and other chainsaws?