\documentclass[9pt,twoside]{article}
\usepackage{geometry}
\geometry{
% The next two lines create a half-size document for a booklet
	paperheight=8.5in,
	paperwidth=5.5in,
% If you are using regular size paper, you can delete them, and
% add "letter" or "A4" to the documentclass declaration
	top=0.15in, % Adjust the height of your page number from the top of the page
	inner=0.5in, % Adjust the inner margin
	outer=0.5in, % Adjust the outer margin
	nohead,
	nofoot
}

\usepackage{fancyhdr}
\pagestyle{fancy}
 \fancyhf{}
 \fancyhead[LE]{\thepage} % This appears on the Left side of Even-numbered pages
 \fancyhead[RO]{\thepage} % This appears on the Right side of Odd-numbered pages
\renewcommand{\headrulewidth}{0.2pt}
\renewcommand{\footrulewidth}{0pt}

\pagenumbering{roman} % Change this to whatever type of lettering you prefer
\usepackage{multido}

\begin{document}
% Change the '18' to however many pages you need.
 \multido{}{18}{\vphantom{x}\newpage}
\end{document}