You should have received a Form W-2 for the amount of stipend you received from 7/1/2012 to 12/31/2012. The W-2 will probably have numbers only in Box 1, and perhaps Box 16 for State wages. That should be it.
You report the amount from the Form W-2 on Line 7 of the Form 1040. You go through the Form, and in the end, calculate your tax. If you had any tax liability
at all in 2011 (did you? Look at Line 61 of last year's tax return) you may have a penalty if you owe more than $1,000.
Depending on what your total tax is for 2012, you MAY have to file Forms 1040-ES for 2013. Again, if I know what your other income
is for 2012 and what you expect it to be for 2013, I can help you with this.
I look forward to your response.
It would be helpful to know what your other income was, if any, for 2012 and 2013.