Hi

Things to consider.

Amazon has only 24h cookie, so personally I would stay away from Amazon specially if I am paying for the clicks.

Everything Lanx have said is true and I would follow his advice.

Things to consider are:

1 keyword / ad group
I usually skip the broad match totally and only use Phrase match and Exact match.

Keyword research is very important for adwords campaigns.

When I run an adwords campaign I research the keywords, I research the competition on this different keywords, check the search amount / month and go from there.

I do make rule for my self that a new campaign need to sell atleast in 50 clicks.

Sometimes I let it go to 100 clicks but it would be something I really believe in very much to let it go that much.

The click cost I decide on my 1 in 50 sale, so if I make $100 / sale I will divide 100 / 50 and that gives me a $2 / click
Its just a rule of thumb that I have made up for my self to make it some what easier to decide on the click price.

Keywords that I use long tale or short tale will have to fit either in the title of the Adword ad or the second line of it.

and if it fits in both places I make 2 diffrent versions and split test the ad.

Landing page.

I setup an wordpress blog with all my different landing pages under one blog.
This makes the page also SE ready and it will show up as a page with many diffrent articles on.

I use plugin named exec-php so that I can execute php code inside of the wordpress articles.

This way I control the words on the landing page.

I use this php code instead of the keyword that I am trying to target.
<?php echo str_replace('-', ' ', $_GET['keyword'])?>

Then on each adgroup I add a separate structure to the landing page url.

Example:

"http://www.mydomain.com/mylandingpage/index.php?keyword=my-keyword"

So for example if the ad group is targeting "Google Adwords" as its keyword
I will write my landing page url like this:

"http://www.mydomain.com/mylandingpage/index.php?keyword=Google-Adwords"

This url will add my keyword to the landing page.
I try to hit 5% of my landing page with this keyword so that the page will be optimized for this keyword.

Well I think I said everything I do.

But if I missed something or you come to think about something that you would like to know, please ask and I will try to answer.

Best regards
Kandor