Hi Ashley
Sorry to hear your application was rejected. I would suggest that you first read through the reason for the refusal and then collect documents for each point of the refusal letter to show that the application should be allowed and that the decision to refuse the application was wrong.
Once you have all the documents you must then send these to the Appellant and also the AIT before the 4 January 2010. I would also suggest that you have a very strong covering letter to fight the decision that was made so that the Appeal is granted. However do be aware that Appeals can sometimes be very expensive and lengthy.
If you need any more suggestions I shall be happy to help.
Good luck