How to process a reviewed file in Studio

I am a new user of Studio 2011 and I would like to know (in simple terms) how to send a completed translation to my client (who has Studio 2011) for review and how to process the reviewed file in Studio in order to to confirm or reject the changes made.

I do not even know whether I should send the file with the extension sdlxliff toi my client or the file with the extension sdlproj as well, and whether to open a new project for processing the reviewed files or whether the reviewed files can somehow be processed included in the original project.

I would appreciate all help.

Suvi