\documentclass[10pt,twoside,letterpaper]{report}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{makeidx}
\usepackage{graphicx}
\usepackage{kpfonts}

% Let's set this as a half-letter sized sheet
% https://tex.stackexchange.com/questions/338789/how-to-set-paper-size-to-half-letter-5-5-x-8-5-in-in-amsbook
\usepackage{geometry}
\geometry{
	paperheight=8.5in,
	paperwidth=5.5in,
%	heightrounded,
	margin=0.5in
}

% Adjust the top and bottom margins
% http://kb.mit.edu/confluence/pages/viewpage.action?pageId=3907057
\addtolength{\topmargin}{0.5in}
\addtolength{\textheight}{-1in}

% Set the header style
% https://www.overleaf.com/learn/latex/Headers_and_footers
\usepackage{fancyhdr}
\pagestyle{fancy}
 \fancyhf{}
 \fancyhead[LE,RO]{the codex}
 \fancyhead[RE,LO]{Issue \#001}
 \cfoot{Page \thepage}
\renewcommand{\footrulewidth}{1pt}

% Include sections and subsections in the TOC
% https://latex-tutorial.com/tutorials/table-of-contents/
\setcounter{tocdepth}{2}

% We will probably want some two- or three-column sections
\usepackage{multicol}

\usepackage{kantlipsum}

\author{Kenneth John Odle}
\title{{\Huge the codex}\\{\footnotesize Life with Linux — A Zine\\Typeset in \LaTeX}}
\date{2021\\ August}

\begin{document}
\maketitle
\tableofcontents
\chapter{Introduction}
This is just some dummy text
\section{Part, the First}
\kant
\section{Part, the Second}
\begin{multicols}{2}
[This is the beginning of our great submission.]
\kant
\end{multicols}
\kant
\end{document}