Instead of a thousand words here is a pano in two versions
a) with yaw/pitch/rotate set automatically
b) with yaw/pitch/rotate initially set automatically and further manually adjusted
Follow the river bank line - it must be as straight as possible. However, even getting automatic y/p/r takes about 10 more parameters to be set, like lens type, HFOV, etc,etc - with no template available when you make more than one panorama. 