How to use the memoir package to make a custom title page

There's probably an easy way to do this, but how can I add a memoir title page style to an existing document? I have tried this code, but I still get the basic title page.

\documentclass[12pt,a4paper,twoside]{memoir}
\usepackage[T1]{fontenc}
\usepackage{geometry}
\usepackage{xcolor}

\drop = 0.1\textheight
\vspace*{\baselineskip}
\vfill
\hbox{%
\hspace*{0.2\textwidth}%
\rule{1pt}{\textheight}
\hspace*{0.05\textwidth}%
\parbox[b]{0.75\textwidth}{
\vbox{%
\vspace{\drop}
{\noindent\HUGE\bfseries Some\\[0.5\baselineskip]
Conundrums}\\[2\baselineskip]
{\Large\itshape Puzzles for the Mind}\\[4\baselineskip]
{\Large THE AUTHOR}\par
\vspace{0.5\textheight}
{\noindent The Publisher}\\[\baselineskip]
}% end of vbox
}% end of parbox
}% end of hbox
\vfill
\null
\endgroup}

\title{\Huge\textbf{ORTHODOX RULE OF PRAYER}}
\author{\Large\textbf{Father Thomas Moore, Michael Dykes}}
\date{\Large{\today}}

\begin{document}

\title{\Huge\textbf{ORTHODOX RULE OF PRAYER}}
\author{\Large\textbf{Father Thomas Moore, Michael Dykes}}
\date{\Large{\today}}

Towards evening, we stand before the holy icons (having lit a candle and        maybe some incense), with reverence and fear of God; we gather our thoughts, make the        Sign of the Cross, and say:

\end{document}


Thanks!!!

-

You only need to create the \drop length and invoke \titleGM in your document (I did two other minor changes, setting the page style to empty an changing the height for the rule to prevent an overfull \vbox):

\documentclass[12pt,a4paper,twoside]{memoir}
\usepackage[T1]{fontenc}
\usepackage{geometry}
\usepackage{xcolor}

\newlength\drop
\newcommand*{\titleGM}{%
\thispagestyle{empty}
\drop = 0.1\textheight
\vspace*{\baselineskip}
\vfill
\hbox{%
\hspace*{0.2\textwidth}%
\rule{1pt}{\dimexpr\textheight-28pt\relax}%
\hspace*{0.05\textwidth}%
\parbox[b]{0.75\textwidth}{
\vbox{%
\vspace{\drop}
{\noindent\HUGE\bfseries Some\\[0.5\baselineskip]
Conundrums}\\[2\baselineskip]
{\Large\itshape Puzzles for the Mind}\\[.37\baselineskip]
{\Large THE AUTHOR}\par
\vspace{0.5\textheight}
{\noindent The Publisher}\\[\baselineskip]
}% end of vbox
}% end of parbox
}% end of hbox
\vfill
\null
\endgroup}

\title{\Huge\textbf{ORTHODOX RULE OF PRAYER}}
\author{\Large\textbf{Father Thomas Moore, Michael Dykes}}
\date{\Large{\today}}

\begin{document}

\titleGM

Towards evening, we stand before the holy icons (having lit a candle and        maybe some incense), with reverence and fear of God; we gather our thoughts, make the        Sign of the Cross, and say:

\end{document}


To automatically use the information contained in the standard commands \author, \title, some modification is required:

\documentclass[12pt,a4paper,twoside]{memoir}
\usepackage[T1]{fontenc}
\usepackage{geometry}
\usepackage{xcolor}

\makeatletter
\newlength\drop
\newcommand*{\titleGM}{%
\thispagestyle{empty}
\drop = 0.1\textheight
\vspace*{\baselineskip}
\vfill
\hbox{%
\hspace*{0.2\textwidth}%
\rule{1pt}{\dimexpr\textheight-28pt\relax}%
\hspace*{0.05\textwidth}%
\parbox[b]{0.75\textwidth}{%
\vbox{%
\vspace{\drop}
{\Huge\bfseries\raggedright\@title\par}\vskip2.37\baselineskip
{\Large\bfseries\@author\par}
\vspace{0.5\textheight}
}% end of vbox
}% end of parbox
}% end of hbox
\vfill
\null
\endgroup}
\makeatother

\title{ORTHODOX RULE OF PRAYER}
\author{Father Thomas Moore, Michael Dykes}

\begin{document}

\titleGM

Towards evening, we stand before the holy icons (having lit a candle and        maybe some incense), with reverence and fear of God; we gather our thoughts, make the        Sign of the Cross, and say:

\end{document}


-
Whenever I add what yuu said above t my code, I keep getting an error mssg; simply: xdg-open prayerbook.pdf and the document will not open –  Michael Dykes Aug 31 '12 at 19:18
Nevermind, now it complies and opens fine! Thanks a bunch!!! –  Michael Dykes Aug 31 '12 at 19:20
Now, how do I change the title, author, etc to what I have below in \title, \author, etc? Thanks. –  Michael Dykes Aug 31 '12 at 19:29
@MichaelDykes I updated my answer showing how to automatically include the information for the \author and \title fields; for the \date field, I didn't know where to place this field. Can you please tell me if you want also the date to appear in the titlepage and exactly on what position? –  Gonzalo Medina Aug 31 '12 at 19:45
Upon reflection, I think I could do without the date here. However, when I use your modified code; it compiles, but the pdf file cannot be opened. Am I doing something wrong? Thanks again. –  Michael Dykes Aug 31 '12 at 23:05