Have a look at this video.
http://www.screencast.com/t/TAq5mz4i
Once you are logged in to your Google Adwords account, you will click the menu for tools and analysis. Then choose conversions. The easiest way to decipher the ID is to create a new conversion and walk through the steps. You will eventually get to a screen that has a script that looks like the one below.
The ID we need to insert in your storesetup.wws Google page is: 954787374
<!-- Google Code for new sale Conversion Page -->
<script type="text/javascript">
/* <![CDATA[ */
var google_conversion_id = 954787374;
var google_conversion_language = "en";
var google_conversion_format = "2";
var google_conversion_color = "ffffff";
var google_conversion_label = "llwyCIKNwgMQrsyjxwM";
var google_conversion_value = 0;
/* ]]> */
</script>
<script type="text/javascript" src="https://www.googleadservices.com/pagead/conversion.js">
</script>
<noscript>
<div style="display:inline;">
<img height="1" width="1" style="border-style:none;" alt="" src="https://www.googleadservices.com/pagead/conversion/954787374/?label=llwyCIKNwgMQrsyjxwM&guid=ON&script=0"/>
