What you need is the machine name for your field. This can be found by browsing to the content type in the admin, and seeing the value in the machine name column in the table. Within your node.tpl.php you can then access it using:
By way of a more comprehensive description of how to render different elements of your node within the node.tpl.php, please see the rest of this answer.
You can implement this in a corresponding node template for your theme: In your theme directory, copy the default
node.tpl.php from Drupal itself (resides in
root_directory/modules/node/node.tpl.php, then make a second copy,
node--content_machine_name.tpl.php. The variable you're interested in is an array which contains all the contents of the node you're about to display (from the Drupal API docs):
$content: An array of node items. Use render($content) to print them
all, or print a subset such as render($content['field_example']).
$content array within this template then allows you to print either sections of the array (field by field for example), or to print the whole array, or to hide sections in the print of the whole array to display later.
By way of a couple of examples:
To print a specific field output:
<?php print render($content['field_name']); ?>
Or to delay the printing of a field until after you've printed the rest of the content. (This is used in the default
node.tpl.php to print comments after the article content .
// Don't print the comments during the main content run
// Render the main content array
// Then render the comments last
Which will print the field after the main content block. For more information check out the node.tpl.php docs.