eagleblizzard wrote:
Is there anything I should focus on with a punching bag? Or just go at it and the workout will take care of itself
Just go at it - hooks and rips (short, vicious uppercuts at a 45-degree angle just under where the ribs would be) really help you transfer energy from your feet, through your pelvis and then onto the shoulder girdle. It's this generation and transfer of torque which helps you develop that solid link I spoke of earlier. But as a skills base it's good to develop a left jab (if you're right-handed). It doesn't require a huge time commitment, just basic skills to get more out of your workout.
I'm not sure how strong you are but it can sometimes be easy to injure your wrists if you have a powerful natural punch and aren't accustomed to bracing your wrist properly. Watch a few tutorial vids on YouTube - it's not very complex and a few key techniques will help keep you away from trouble.
One thing I forgot to mention is if you're using an army bag with lawn clippings which is an excellent place to start (nice and light, cheap, easy to set up), the clippings will settle significantly as they dry out and you pummel them down. So keep topping it off until it's nice and firm and stable.
Good luck - home workouts are fun and easy to get started on, and once you figure out a routine which works for you, it's a skill you can always draw on, meaning you're never without a place to work out if you have a floor and maybe a tree branch within reach.