Private limited company tax file

Hi,

   I would like to know the forms I need to use to file tax return. I opened up a pvt limited company in 2007 and didn't do any business.I haven't file any tax returns till today. Which forms I need to use to file this and how i can file for all those years.

Is there any penalty if yes , how much.

If i want to close this company then too i need to file returns?

Thanks,