A base stock installation on a stock database does not require any changes to create tickets... if its installed correctly it just works.
However, if you are using an old Database that you added fields to, you will need to re-add the fields to OST. You may find this thread helpful to do that:
http://osticket.com/forums/showthread.php?t=7300(http://osticket.com/forums/showthread.php?t=7300)