1 - Goalie (see and understand the defense)
The goalie position is pretty self explanatory. Defend the goal. But, it is important for a good goalie to understand the defense and BE VOCAL. Let the defense know when they are too strung out, to push out of the box quickly when the ball is cleared, and to push up the field when we are on the offense.
Lastly, do not expect to play an entire game in goal unless there are injuries that dictate one goalie. Typically I use two and they split the game. That means you will play half a game on the field. The more you understand and can play the field, the better the goalie you will be.