If you have all the equipment and a timer then just blast away on the bags. Do 3 full minutes on a heavy bag(just punches), then 3 minutes on speed bag, then 3 minutes on kick bag, then 3 minutes doing elbows and knees, then 3 minutes combining all of that. Take a minute or two break, then start all over. this wil ultimately help you gain the proper muscles needed and help yu hit harder.
Also pay attention to which muscles are sore afterwards as then you can specify weight training workout to those specific muscles.