The documentation on WebHostManager and Cpanel is good but doesn't seem to be all inclusive. In the documenation it mentioned that there was a discussion or mailing list you could subscribe to for updates and information. Does anyone know how to subscribe to this list? Furthermore, does anyone know of any other resources or how-to's for these two products?

There used to be a mailing list for cpanel/whm but since the split they are gone. If you are with VDI try the vdi forums for some type of help. If you are going through burst they probably will eventually have a mailing list again.