One of the most important things you can do is use cross-referencing
commands that REVTeX and LaTeX provide for \section, \bibitem,
and \cite. Use \ref and \label for tagging figures
and tables.
Not only will you get automatic numbering, but this markup will be translated by AIP's conversion software to create ``SGML-like'' hyperlinks, which will then be used in electronic journal products such as on-line journals and CD-ROM's.