How to create Google Adwords Re marketing campaign?

1.     Define your remarketing strategy.

o    Will you target all visitors to your site?

o    Are you only interested in targeting visitors to a specific page?

2.     Create the remarketing code.

o    AdWords > Shared Library > Audiences > + New Audience > Remarketing List

3.     Fill in all of the required parameters including membership duration, list name, and a brief description of the tag. Then click “save.”

4.     Navigate to the new remarketing code and click the “tag” link.

5.     Copy this new remarketing code to the appropriate pages.

6.     Next, navigate back to “all online campaigns.”

7.     Create a new campaign and include “Remarketing” in the campaign name.

8.     Create a new ad group within the “Remarketing” campaign and define the ad group default Max CPC.

9.     Add both text and image ads to this new ad group. Here are the image ad size requirements:

10.   Next, stay within the newly created ad group and click on the “Display Network” tab then the “Interests & Remarketing” button.

11.   Click “+ Change display targeting” > “Remarketing Lists” > and select the remarketing list you created in step2 > then click save.

12.   You are now all set. Your remarketing ads will not begin to show until this new remarketing code tags at least100 unique visitors within30 days.

1.     You can see the size of your lists in the audiences section of Google AdWords.

Remarketing requires a list of people who you would like to retarget. So, creating a list is an important task in successful remarketing campaign. You can create a list using by placing a retargeting code on a specific page or use Google Analytics( Universal analytics required) to create a list. 

Once the list is created, you view it in your shared library and start a campaign.

Check this link if you are beginner in retargeting: https://support.google.com/adwords/answer/3210317?hl=en