I can elaborate more: a typical work might be support of the sales force which might use the activity or sales order component of CRM. Or inhouse sales who might eventually use the interaction center component of CRM. It depends heavily on what your company has installed. So you might help your users on the phone or with remote access. Eventually you will also correct customizing or do development support which means correcting coding if you have the skills. Standard problems would be reported to SAP via OSS messages.
Best regards,
Thomas Wagner