http://www.collodion.com/
The above will get you to the site of Quinn Jacobson who gives wetplate collodian workshops. He is now in Germany so those on the continent may have a treat coming if he does them there.
He has a new book out taking you from the raw materials to the finished product... ambrotype, collodian negative or tintype. It is well done and has good illustrations. You have to contact Quinn to purchase it. It is what he has been using as a syllabus for his workshops and filled out to make the full book.
If you are looking for more info on the wetplate process Quinn is a good source.