Starting Hand on Web Mapping.

Hi All,
I need to get my hand on web mapping, I am completely new to this,
though I have being working with GIS for over two years. I need to serve
all my maps across users through the internet/intranet. Any idea on how
I might start this, I am on my toes starting. Please point me to
reference materials that might be helpful or just tell me what I need to
do or if there is anywhere I can get online training.

Thanks
John