\documentclass[12pt]{article}

\usepackage{comment}

\newcommand{\firstName}{FirstName}
\newcommand{\lastName}{LastName}
\newcommand{\docTitle}{My Document}
\newcommand{\email}{email@example.ca}
\newcommand{\userID}{123456789}

\newcommand{\courseNum}{COURSE 101}
\newcommand{\labName}{Lab 0}
\newcommand{\labSection}{D00}

\usepackage{pdfpages}

\usepackage[hidelinks]{hyperref}
\hypersetup{
    pdftitle={\docTitle{}},
    pdfauthor={\firstName{} \lastName{}},
    bookmarksnumbered=true,     
    bookmarksopen=true,         
    bookmarksopenlevel=1,       
    colorlinks=false,            
    pdfstartview=Fit,           
    pdfpagemode=UseOutlines,    % this is the option you were lookin for
    pdfpagelayout=TwoPageRight
}

\title{ {\Huge \docTitle{}} \\
    \courseNum{} - \labName{} - \labSection{}}
\author{
    \firstName{} \lastName{}\\
    \texttt{\email{}}\\
    \texttt{ID: \userID{}}
}

\begin{document}
\pagenumbering{roman}
\maketitle
\newpage
\tableofcontents
\newpage

\pagenumbering{arabic}

\section{Section}

\subsection{Subsection}

\subsubsection{Subsubsection}

\begin{comment}
Use this to attach a pdf, such as a marking sheet
\includepdf[pages=-,pagecommand={}]{./YourPDFHere.pdf}
\end{comment}

\end{document}