I have just created my first adwords campaign and i am interested in one thing. If i set my max bid on 0.20 dollars per click will i be always be charged this price or i will be charged the minimun bid?
you will be charged something between the min bid and the max bid. It all depends on your competitors bids and your quality score
Visit this link http://seotech.wordpress.com/2008/05/31/advertising-cost-quality-score/ for detailed answer.
On one of my keywords right now, I put a max cpc of $2.00. While all my clicks have an average of 0.60 cents so far.