Here's the link you NEED to go through when creating the product pages

https://support.clickbank.com/entries/22806357-Cre...

As mentioned inside, you need to create 2 pages, The pitch page and the thank you page.

Pitch Page

Most of the info you need to provide are as stated in the link, and you too need to include the following,

• Payment Link

<a href="http://ITEM.VENDOR.pay.clickbank.net" target="cb">CLICK HERE TO PURCHASE</a>

You can paste this in WP page HTML editor (Not the visual editor), you have to update the item number and the vendor name,

if this is the first product, item number will be 1, and the vendor name is your register NAME on Clickbank, for example:

<a href="http://1.NAME.pay.clickbank.net" target="cb">CLICK HERE TO PURCHASE</a>

if you are familiar with html coding, you could use the payment image as provided by Clickbank. https://support.clickbank.com/entries/22829862-cre...

• Clickbank Trust Badge

This is another requirement by Clickbank, where you have to provide a badge on your pitch page, I recommend to add this badge at the bottom left of your page, to do so, go to Settings, then My Site,

Insert this code at the end of your pitch page, in HTML editor, and you are done.

Thank You Page

Again, Most of the info you need to provide are as stated in the link above, and this is the page where you provide the link to download your product, if you do not want Clickbank to host it for you.

When you have done all the requirements above, there's one more step you need to check.