As most everyone is saying: Wrap your hands, wear proper gloves, but best is to go find a good gym and trainer who will teach you the basics correctly.

Otherwise you will be (almost certainly) practicing incorrectly. And if you practice wrong you will only get good at DOING IT WRONG.

Once you have the basic well enough to self-correct or self-coach, then you can hit away to your heart's content.

The original saying was: Practice makes perfect.

That's wrong. So it was changed to: Perfect Practice Makes Perfect.

Close, but it is unlikely you can always do it perfectly (enough) so the best way to think about practice is: Perfecting Practice makes perfect.

Always improving.