My aim for this post is to point you to Games Workshops website, where the not so easily found documents are located. these are all in PDF format and are being updated more regularly than they used to be!
'FAQ's and Errata'
I have also included a link below to Forge Worlds download's page, when you will find 6th Edition updates and Experimental rules for using Forge World models in your game.
All of the PDF files on both Games Workshop and Forge World are completely free to download and can be stored on your computer or printed off for ease of use.
Hope you find the answers you want?
~ A Pure mind is the strongest of all Weapons ~