There is a great deal of technical information on the website, but exponentially more in Living Craft, which was written to tell the story in detail, and comes with free e-support.
A great option for general oil painting questions is to contact the technical support people at Williamsburg, who are artists themselves and have a great deal of experience with questions. They have a quality selection of technical information online here, a great set of technical bulletins here, and you can also contact them directly here.
There are also now many well-informed and polite, forums. A recent one with an emphasis on reconstructing historical aspects of the craft effectively is MITRA at the University of Delaware. After decades of neglect, it's great to see an American university take an interest in the craft.