You can change your camera angle by holding the right mouse button and moving your mouse. You can also Alt+Right Mouse button to focus on a certain place. The mouse scroll wheel will zoom the camera in and out. 

The F4 button on your keyboard will enable Fly Cam. You can use the A and D keys to pan from side, and use the W and S keys to zoom in and out. If you want to rotate the camera, hold the right mouse button and move the mouse.