Hmmm....you'll have to explain a bit more about what you mean by dynamics.  There are a million things you can do to change the dynamics of a track.  2nd question:  You can get different drum beats several different ways....program them yourself is one way.  Another way is to throw an existing loop into the slicer and reprogram the loop and yet another is to throw an existing loop into the sequencer and augment with your own beats.  You can find several sites out there that have free loops for download or if you use a p2p you can search drum loops and find several.  Hope that helps ...if not feel free to repost or PM me with more specifics.