how to identify field names and table names as per the client requirement

Dear All,

i am preparing reports for my client of their own requirement, but in sap how can i find the field name, table names like for eg: doc.no, issue,revision no, revision date, date of issue,date of completion, job card no,identificatin no, part no , accept,inspected,testedby, remarks, issue, process.

so please tell what is the path to find the field names and table nae