Welcome to AdWords! Here are some articles from our Help Centre which will be useful for starting your first campaign:
Get Started in 3 Basic Steps: http://support.google.com/adwords/answer/1704406?hl=en&ref_topic=1713895
Create Your 1st Campaign: http://support.google.com/adwords/answer/1704395?hl=en&ref_topic=1713895
AdWords Basics: http://support.google.com/adwords/answer/146287?hl=en&
You can also call the AdWords Support team for help in optimising your campaign - Find the relevant number by clicking on the red 'Contact Us' button on the right hand side of the Help Centre screen.
Hope this helps!