It's a third person, heavily skill shot based MOBA. So no you don't have to be pro to learn how to play. The skills rollover from other games (especially WoW), so you don't really have to relearn basic mechanics. And new players are matched with all new players (so besides from smurfs), you should have a relatively easy time.
If the windows are not moving, then it is a bug (although, check that you haven't clicked pause on the game). Otherwise, they should be moving and recreating the game pong. The plain yellow is the ball, the striped are the paddles for the characters (controlled by A&Z for the left one and UP&DOWN for the right one). Tick one of the boxes as non human to play against a computer.
It's a third person, heavily skill shot based MOBA. So no you don't have to be pro to learn how to play. The skills rollover from other games (especially WoW), so you don't really have to relearn basic mechanics. And new players are matched with all new players (so besides from smurfs), you should have a relatively easy time.