Just tap on the filename in the my documents to rename the document.
To send via mail or upload it to iworks or export the document tap on the first icon under the filename with the box and right turning arrow to bring up the sharing menu and select your option. The export option in the sharing menu will export the document as pages or PDF or doc format and will put the file in the iTunes file sharing menu, from which you can save the file into your Mac when ur iPad is connected to iTunes. iWork will also help you upload the document to the cloud from which you can download in pages or pdf format.