Here are some free documents that may be useful to you:
  • Before buying a translation service, read this guide to buying translations from the website of the British Institute of Translation and Interpreting.
  • On the American Translators Association website there is a guide to interpretation, which explains how interpreting works and how to choose the right person for you.
  • If you need a writing manual, download this guide from the European Commission, titled How to Write Clearly.