I found some helpful information here https://developers.google.com/adwords/scripts/ It looks like a basic understanding of JavaScript is sufficient to write your own script. There's a 17 minute video on that page that gives a good introduction to deploying a custom script. Best of luck!
I will suggest landing page. I clicked the link and I was not impressed. A landing page should offer all the necessary information, but not so much as to overwhelm the visitor. Provide the essential info that will interest your audience and nothing more. We just discussed how you do not want to ...