@ Mathia The punch can be used to get out of bunkers or rough . Its also a great go to on approach shots . You have the top 3 Cleveland wedges:
L76+ 56w- 100 yrds. punch 84 yrds
L78+ 60w - 80 yrds punch 64 yrds
L80+64w-60 yrds.punch 50 yrds
Depending on the ball you use the yardages will be slightly different so you will have to practice to find your true yardages . I use the punch when I find myself within the distances to the pin and I dont want to power down on a full wedge . Its great for when you find yourself in between your clubs on approach shots . Its also a great go to for shots in head winds and you want to keep the shot low .
The best way to learn the punch shot is practice . I started with practice stroke play and used the rock just to get the basics down and to also learn how . Once I got comfortable with it then I began to use my main ball so I could apply it to my game . Although you can punch with all of your clubs I personally use it for approach shots and occasionally with long irons on courses like St.Andys or George .
So do stroke play practice rounds and learn how to hit and use the punch shot . Use the rock first and go play all of the courses so you can see how it will play on that course . Try it from the rough the bunkers and the fairways for approach shots and be sure to use the mulligan and just learn the shot . This is how you learn the how when and the where .
Once you get to where you can hit the punch with good results on a fairly consistant basis then you play some practice rounds using your main ball . The yardages will be different but you will have a starting point to begin with and the adjustment wont take that long . There are other threads on the punch shot just use the search box and ask as well . You already know that there is plenty of help here to point and guide you in the right .
Also do the same thing with learning the pitch shot to improve your game . This is the process for a better game . Once you learn those 2 and addthem to your game then you will find that getting closer to the pin is easier and the putts will be too . Hope this helps you out and good luck with your game ..