Some real good advice here. Wonder whether I might add a couple of points.

  • Double end bags are great. Just be careful to use it properly, that is no power shots, all fast, light shots with some nice head movement. I've seen many a sheepish looking boxer standing over a broken double end bag because they hit it too hard.
  • You may wish to consider an angled bag. This type provides some nice options with uppercuts and hooks that you would normally get with a Maize Bag. The link below gives some advice on bags.
  • The advice on hand protection is real smart. The hand wrap video below might help.
  • A 30 minute session is quite short, but if you work it right you'll be good. Make sure you do a short warm-up, followed by a round or two of shadow. When building stamina, an option is to do a 15 minute round, slow and steady, but no breaks. On a timer that's 4 x 3 minutes plus the 3 x 1 minute rests - work right through. Do this a few times a week for a couple of weeks, then switch to rounds.
  • Structure is very important. As RagingBull said, you'll need a timer. There are free timer apps out there, there's also a good on-line (free) one as well, if you can have your laptop nearby. Do a search on google on "free workout timer".
  • Try to finish on some ground work, sit-ups, press-ups, plyometrics and so on. Then some static stretching.


Boxing Punch Bags

Boxing Hand Wraps

Hope this helps, Good luck mate.