Hi,
To have the info icon, you just have to set a description in the product added as an option. And the icon should be displayed automatically.
If you need the description of the option, the option product need to have variants. It's the variants which give details in the dropdown.
If you had variants, you should lost the "No" option, so you will have to add a characteristic with the name set as "No" and a price of "0.0001" to set it as free.
Hope this will help you to put your website online tomorrow.