coding with custom fields

I created a custom field with name FF_address

I want to display the field at some position of my post, someone suggested me the following code:

ADDRESS: <?php echo get_post_meta($post->ID, 'FF_address', true); ?>

However I want to make two modifications,
1) ADDRESS: has to be bold letters
2) do not show this field if it was left empty (nothing inserted for this field in the post editor)

Many thanks!