How do I insert an image at a specific point in the document?

You can control the position of an image using options for the figure environment, e.g. the "[h!]" in the example below tells LaTeX to put the figure exactly where it appears in the text, instead of letting it `float' to a particular place in the document.

  \caption{A picture of a gull.}
  \includegraphics[width=0.5\textwidth]{Image File Name}

For more information, please see the wikibook article:,_Figures_and_Captions.