You can write first names, last names, telephone numbers, the full name or a combination of everything. In fact, you can add whatever you want and how you want. Of course, it is important to look at the preview box to make sure that the text is not too long and legible, which can reduce the font size. The best font for texts with many characters is number 1, which gives more visibility to the text.
It is also important to take into account that the Packs are made up of labels with a single line and others with two lines, with which the text of the second line must be complementary since it is only visible in the large labels that do allow 2 lines of text. text.