Check out SourDom's [url=http://sourdough.com.au/blog/sourdom/]Beginners Tutorials[/url] for invaluable help on getting started with Sourdough bread.
the tutorials are:
How to make your own starter .
How to use short kneads to handle moist doughs and bake a loaf with a yeast-based preferment.
The subtleties of proving a loaf using a ‘biga’.
How to shape a loaf using a hybrid recipe.
The final crucial steps and putting it all together to bake a 100% sourdough loaf.