You have to apply for transfers online only ONCE, so go through the model sample application provided here in this website and make yourself sure that you have entered everything correct when you Apply online at the official website www.aponline.gov.in. Please note www.teachersdata.com is NOT an official website for applying for transfers.
Click HERE to View Sample Transfers Application.
Click HERE to Download Sample Transfers Application.
Click HERE to Apply ONLINE for Teachers Transfers - 2011 (Official aponline website)
Click HERE to find your Employee Code Number