\documentclass[12pt]{article}  % list options between brackets
%\usepackage{fullpage}
\usepackage{url}
\usepackage{fancyhdr}
\usepackage{sectsty}
\sectionfont{\large}

\pagestyle{fancy}
\fancypagestyle{plain}{}

\def\RFCnumber{?}
\def\RFCshorttitle{Short title}
\def\RFClongtitle{Long title}


\lhead{BBF RFC \RFCnumber}
\rhead{\RFCshorttitle}

\begin{document}

\begin{center}
{\large \textbf{BBF RFC \RFCnumber: \RFClongtitle}} \\
\vspace{12pt}  
First Author, Second Author and Third Author \\
\vspace{12pt}
\today
\end{center}

\section{Purpose}

This Request for Comments (RFC) proposes to do something useful for the field of synthetic biology.

\section{Relation to other BBF RFCs} 

BBF RFC \RFCnumber\ does not update or replace any earlier BBF RFC.

\section {Copyright Notice}

Copyright (C) The BioBricks Foundation (2008).  All Rights Reserved.

\section{Section}

Insert text here.

\section{Section}

Insert text here.  Add additional sections as necessary.

\section{Authors' Contact Information}

First Author: \url{noone@institution.institutiontype} \\
Second Author: \url{noone@institution.institutiontype} \\
Third Author: \url{noone@institution.institutiontype} \\

\bibliographystyle{unsrturl}  % Style BST file
\bibliography{yourbibtexlibrary}

\end{document}