Tax benefit from home loan repayment and stamp duty

Sir,

I have purchased a house from private builder who built it over a period of 3 years. Payment was made directly by loan providing govt agency (total Rs 25 lacs) as per demand raised by builder in last three years. i have got the possession and registry of house (Rs 2 lacs) in June 2014. Till now in  have not claimed any tax benefit and my tax has been deducted by govt employer. plsease advice on following:

(a) what all tax benefits can be claimed

(b) whcih ITR forms filining return and what all sections to be filled

thanks and regards

vicky