[Tex/LaTex] Page numbers in different positions on different pages

page-numbering

I'm having problems with the page numbers in my document. I'm using a template that my lecturer has given us all and haven't touched the page numbers but they appear in different places as you go through the document. It's at the bottom, centre of the page on the first page, and the numbers carry on from then on to be in the right hand top corner. I've tried to fix this myself but I can't seem to, however this is my first time using LaTeX. Any suggestions would be appreciated. Here is what I've got at the top of the document currently:

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath,graphicx,hyperref,parskip,gensymb,fancyhdr}
\usepackage[cm]{fullpage}
\setlength{\headsep}{0.6 cm}
\pagestyle{myheadings}

\begin{document}

I also tried \pagenumbering{gobble} to get rid of them (which worked) and then \pagestyle{arabic} to bring them back- hoping they would all be in the same place but this didn't work. Preferably, I would like all of the numbers to be at the bottom of the page, in the centre. Thanks!

Edit:

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath,graphicx,hyperref,parskip,gensymb,fancyhdr}
\usepackage[cm]{fullpage}
\setlength{\headsep}{0.6 cm}
\pagestyle{myheadings}

\begin{document}

\title{Modelling the Back End of a Bus}

\maketitle

\begin{abstract}
.....
\end{abstract}

\section{introduction}
....
\end{document}

Best Answer

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath,graphicx,hyperref,parskip,gensymb,fancyhdr}
\usepackage[cm]{fullpage}
\setlength{\headsep}{0.6 cm}
\setlength{\headheight}{15pt}% comment this line and the next for no header
\addtolength{\textheight}{-15pt}
\usepackage{fancyhdr}
\pagestyle{fancy}
%   \renewcommand{\headrulewidth}{0pt}% if you don't want a rule
%   \fancyhf[lh,ch,rh]{}% for no header
%   \fancyhf[lh]{Something left}
%   \fancyhf[rh]{Something right}
%   \fancyhf[ch]{Something centre}

\title{Title}
\author{Author}

\begin{document}

\title{Modelling the Back End of a Bus}

\maketitle

\begin{abstract}
.....
\end{abstract}

\section{introduction}
....

\newpage

some text
\end{document}

fancy page style

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