You can use spurs to lighten your cues, as long your not using them to make him go faster and careful about not constantly bumping him when you ride. Otherwise he will continue to get duller.
You would use them in a progression of cues, using the spur as a last resort. So you would use your foot/calf, then if he didn't listen you might get louder with you foot/calf and still no response then you might gently roll your rowel up his rib. As soon as he moves off your leg you quit spurring. Soon he will figure out that if he listens to your foot/leg then the spur isn't needed. Roll your rowels don't jab at him, this causes swishing tails.
As for the style of spur need depends on you and your horse. If you are long legged a gooseneck might be helpful to reach the side of your horse. Or if your shortlegged and ride a big barreled horse a drop shank might help you keep out of his sides.
The rowel will also depend. The more points on the rowel, the easier they are. Maybe since you are starting out, maybe try a coin rowel or one with plenty of points.