Terminal velocity and Inicial velocity they are related?

Well the only relation they have is that they are both velocities.

The initial velocity of an object is the velocity it begins moving with. i. e if a ball is thrown its initial velocity is the velocity it has once it leaves the hand.

Terminal velocity is the maximum velocity an object can achieve when it is in free fall. i. e if a bowling ball is dropped from a plane, its velocity will increase until it reaches terminal velocity.