By switch hitting I am assuming you mean a boxer that can fight with both right or left hand? Boxing stances are easy. Right hand dominate fighters lead with their left hand and foot. Left hand dominate are the opposite, leading with right hand and foot.  When transitioning between stances usually comes as a side step or backward step to set up jabs to take advantage of something the fighter sees. Usually a tell like a dipping shoulder or elbow opening the fighter to a combo.