font

Do you have that font file? If so, in which format(s)?

No, I don’t! Do I need one?

Yes – you need the font file. Ideally in multiple formats.

If you can’t purchase it then you may want to consider looking for a similar and free font https://www.identifont.com/similar.html

Or try https://www.google.com/fonts/

Thanks, once I have the font/s what do I do next please?

You have to embed them into the stylesheet of your theme (or child theme, in this case). See https://www.w3schools.com/cssref/css3_pr_font-face_rule.asp