Rock Mobile uses blocks the same way as Rock Web does. You create pages, add blocks to them and configure them. Then when you deploy your app all that information will get bundled up so the Mobile app knows how to communicate with your site.
Many blocks are mostly self-explanatory, though we're not saying they don't need some documentation too. We do intend to start adding some helpful hints about all the blocks, such as what is available in Lava merges and whatnot.
However, there are certainly blocks that are complete black box of information. Those are the ones that will get documented first, so have some patience as we get this section built out.