There are numerous mortgage calculators on the web that can help you with this. Type in "mortgage calculator" on Google and something should come up.
As a first time homebuyer, be sure to check into the special $7,500 tax credit available. Have a trusted loan officer and a knowledgable Realtor assist you. They will provide many important answers for you.
Knowlege is power. Ignorance is expensive.
Prudential Ambassador Real Estate - Omaha.
You will need to add in taxes and insurance. Depending on the mill levy and the county value, add another
3%. Now we are at approx. $1,000 per month. If you do not have 20% down, you will have a monthly charge PMI (private mortgage insurance) approx .75% of the loan amount divided by 12 months, about $63.00 a month. So you are at $1,063.00 a month. Roughly closing costs are around 3%. You may also need 3% down depending on your loan and credit score. This is not exact but close.
Hope this helps....