If I get you right you want to display content based on the value of a select field on the publish page?
If so here’s an example:
Lets say you have a custom select field with 2 options, Yes/No, the author thene selects the relevent value.
In your front end template all you’d need to do is use a conditional that “tests” the value of the select, eg
{exp:channel:entries channel="my_channel"}
{if your_select_field_name == "Yes"}
{title}
Your content
{/if}
{/exp:channel:entries}
... in this example, if the author has chose “Yes” then the content is output, if they select “no” then nothing is output.
Another way to do this would be to use the search: parameter, an example:
{exp:channel:entries channel="my_channel" search:your_select_field_name="Yes"}
{title}
Your content
{/exp:channel:entries}
... in this example the channel entries tag will only display content when the select value is “Yes”.