How to place ad below title with text wrapping on one side

Hi All,

I have been scouring the forums to no avail for a way to insert adsense code so it shows up only in single post view (or page), beneath the post/page title and meta data (date, author, etc.) with the text wrapping around one side.

i.e, I’d like to place a 250×300 banner so that it appears on the left side, with the post text wrapping around on the right side and below the ad.

I previously used a plugin but would now like to achieve the same thing by modifying my child theme template files. (I do not wish to manually paste the ad code into every post page.)

Does anyone know how to do this? I’m using the Twenty Fourteen theme with a child theme.

Thanks for any suggestions.