If you buy a module, you get the full content of the print copy, highly cross indexed, all maps from the print product, all set up with tokens in place. If you have access to Dynamic Lighting, the maps are also set up for that. You get all creatures and NPCs from the module. In a small number of cases, where WotC did not provide any licensed 
artwork, the tokens are coded with initials. This is a limitation of the
 licensing deal. In the case of the Monster Manual, special tokens were 
commissioned to fill in the few gaps.  In the Monster Manual, you get all creatures, completely set up and ready to go, complete with tokens. From the  Marketplace page , all monsters include:     Circular tokens , featuring original artwork from Wizards of the Coast  Monster descriptions and lore, as well as additional Wizards of the Coast artwork, viewable in the  Bio & Info  tab.  Clickable actions, viewable in the  Character Sheet  tab (using Roll20's 5th Edition OGL character sheet)  Completely filled out stats, viewable in the  Abilities & Attributes  tab  Designed for use with the  Roll20 Official 5E OGL Character Sheet    Xanathar's guide is not yet available. Some sourcebooks have yet to be converted while the underlying functionality that will make them more useful is under development.