I applaud your enthuiasm and anxiousness to get started, but I'd like to suggest that you wait to practice in-water skills until your class. That's what you are paying an instructor for. He or she will explain the skill (performance objective and value) and demonstrate it first. This way you'll hear the description and see it performed before before you do it yourself. This may prevent wrong techniques or habits that have to be unlearned.
Good luck and have fun!
Good luck and have fun!