Using Fresh Masa with Tamales
It's going to depend on the Masa itself. If it is just the fresh ground corn, then you still need to mix in your other ingredients, lard, stock, baking powder, etc, whatever recipe you decide to use.  Some places will sell fresh masa for tamalas already mixed up and ready to go, but it's typically labelled or sold as prepared masa.  Whether you have fresh masa, or masa harina, you will still want to whip your lard and make a light and fluffy texture before mixing in your dough, so an electric mixer is always a good thing to have on hand, or Popeye arms. 

Fresh masa goes bad pretty quick, so make sure to use within a few days or freeze.