If you only used HTTP or HTTPS, or any application-level protocol on top of those,
there is nothing to "convert", there are no procedures. Technologically speaking, this is the same thing:
http://en.wikipedia.org/wiki/Intranet[
^].
However, you need to review your safety practices. If your safety approaches were questionable, they might me good enough for Intranet but could be unacceptable for Internet.
—SA