I would like to make this ball bounce in an angle coming from the left. How do I do it? Please Help thank you very much.
One way to do this is using particles. First add a Sphere and Tab into edit mode and move it in the Z-axis till the origin is at the bottom.
Move this Sphere to a different layer. Next add two Planes. One will be used for generating the ball and the other will be used as a floor. And place them in a manner shown below. Make the floor large enough.
Now, select the floor and go to the "Physics" tab and toggle "Collision". Then select the plane at the top and add a particle system to it. Set the Emission Number to 1. Increase the Lifetime to the length of your animation. Then scroll down to "Render" and toggle "Object". In the "Dupli Object" select the Sphere. Then increase the size to the desired level. Check off "Emitter" so the plane doesn't show up in your render. Now go to "Velocity" and set the starting speed on the Z-axis. Finally press Alt+A to animate.
You can use the Animated setting shown towards the right of your screenshot to set up the initial conditions of the ball. When Animated is enabled, the Rigid Body will not obey physics but will instead be animatable via keyframes. When Animated is switched off, the Rigid Body has the velocity at the point the Animated setting was changed. Animated can be keyframed to set its state at any point in the animation.
So, one solution is to move the object to the start point (ie, off the left) in frame 1 and add a keyframe for its location, enable Animated and keyframe the Animated setting (hold mouse over it and press I), move to a later frame (eg, 5) and move the object to where it would be on that frame and again add a keyframe for its location. Then, on a frame between those two keyframes, uncheck Animated and, again, keyframe the Animated setting in its new state (hold mouse over and press I).
Running the animation should now kick your object off with an initial velocity while it's Animated and then when Animated becomes unset it should continue its path and obey the normal physics and bounce across (assuming you've set the rest of the rigid body physics to allow it to bounce).
See this answer.