1. code listings

Using the lstlistings package, we can easily include code listings; the following code will include a code listing from a file and style it nicely.

% begin code listings stuff
\usepackage{listings}
\usepackage{xcolor}

\definecolor{codegreen}{rgb}{0,0.6,0}
\definecolor{codegray}{rgb}{0.5,0.5,0.5}
\definecolor{codepurple}{rgb}{0.58,0,0.82}
\definecolor{backcolour}{rgb}{0.95,0.95,0.92}

\lstdefinestyle{mystyle}{
    backgroundcolor=\color{backcolour},
    commentstyle=\color{codegreen},
    keywordstyle=\color{magenta},
    numberstyle=\tiny\color{codegray},
    stringstyle=\color{codepurple},
    basicstyle=\ttfamily\footnotesize,
    breakatwhitespace=false,
    breaklines=true,
    captionpos=b,
    keepspaces=true,
    numbers=left,
    numbersep=5pt,
    showspaces=false,
    showstringspaces=false,
    showtabs=false,
    tabsize=2
}

\lstset{style=mystyle}
% end code listings stuff

Then we can call a code listing using

\lstinputlisting[language=c]{main.c}

2. nice-looking headers and footers

The fancyhdr package lets us use nice-looking headers and footers.

You need to enable the twoside option for the odd-only and even-only headers and footers to compile properly. You can do this by writing \documentclass[twoside]{article}. 
% begin fancyhdr stuff
\usepackage{fancyhdr}
% Set the page style to "fancy"...
\pagestyle{fancy}
%... then configure it.
\fancyhead{} % clear all header fields
\fancyhead[RO,LE]{\textbf{The performance of new graduates}}
\fancyfoot{} % clear all footer fields
\fancyfoot[LE,RO]{\thepage}
\fancyfoot[LO,CE]{From: K. Grant}
\fancyfoot[CO,RE]{To: Dean A. Smith}
% end fancyhdr stuff

2.1. but maketitle screws everything up

To remove the horizontal line above the header, use the command \renewcommand{\headrulewidth}{0pt}.

3. Get last page’s number

First, import the lastpage package, then write \pageref{LastPage} wherever you want to include the last page of the document.