After looking online for others that have cycled to all the Trappist breweries it turns out that no one has posted a trip that covers them all. The best we have found is a blog post from a couple that rode a tandem bike from Luxembourg to the Trappist breweries in southern Belgium as well as Westvleteren.
For generic cycle touring advice we used a variety of websites.
This has some good packing tips (we ignored the camping stuff)
This site has great advice for all aspects of touring (the bikes, maintenance, gear, etc)
On to the next post: Our Route.