i have never boxed, but my little cousin did for a bit, and i went for a day and checked it out, they would do 3 rounds of Jump rope, follwed by 3 rounds of shadow boxing, 3 rounds of heavy bag, 3 rounds of ring hand mitts, and another 3 rounds of jump rope....
One thing about boxing, it requires alot of Stamina , Stamina , Stamina and more Stamina
Get you one of those Bell Timers, 3 minutes seem like a life time and the one minute rest goes by faster then it takes you to sneeze