How we can file the tax return from india? Do we need to send all the hardcopy of documents to IRS or can we e-file the return. Please guide.

You can efile or you can send hard copy.
However, if you filing with India address, then you can not efile.

If you are filing a resident alien return (Form 1040, 1040A or 1040EZ), you can efile.

If you are filing a non-resident alien return (Form 1040NR or 1040NR-EZ), then the return must be mailed.