Typically a jersey will sell with a break-down of: 60% player names , 20% custom names, 20% blanks.
Check out Denmark custom jerseys here! link will open in new tab.
Let’s try to look at home a custom jersey may look like.
Here is the official font for the regular DBU home jersey , but with the goalie name and number rather than that of an outfield player.
However, the customization can also be done using a standard font.
It can look something along the lines here.
The printing looks decent but it is important to point out that it is not the official font.