If you are just starting out, my advice is go straight to the documentation for the big networks. For example: visit 'adwords help center' and 'microsoft adcenter help'.
Be careful in getting training from them though. Remember their goal is to get as much money out of your pocket as possible.
there are not single but a lot of online guides which can help you find good things about ppc, see on google.
I started out a number of months ago in PPC and really starting to learn about it...sign into your Google account and search Google Advertising Professionals. This is where you can become adwords certified. In here there is their Resource Library of tutorials that are very, very good. This is the link to where you need to be http://www.google.com/adwords/professionals/