When you move the mouse, the player will continue to dribble in that direction until you move in another direction or press 5 on the numeric keypad to stop your player's movement. But you can't deliberately pass it to them. Shoot anytime you have the ball on your end of the court. Make a Field Goal from within the three-point line and you score two points. Make a Field Gold from beyond the three-point line, and, yes, you get three points.
Some players block shots better than other because they have a greater jumping ability.
There are NO free throws. Free throws are for wimps. Linger with the ball near the half court line for a few seconds, or dribble the ball into the key then back toward the center line, and suddenly all action stops. Now your Offensive Play Box lists four plays. Then press the key again once you get the one you want.