1st off right out of the gate pop them hard one good time and they will come in with that in their memory throughout the sparring session.

Next you need to shaddow box in the ring learn how big it is and use it don't get caught on the ropes. Utilize the jab and the cross, the good old 1-2 can stop any bullheaded fighter from charging in on you and make sure you move after you punch to avoid counters this should really tire out your opponent