I’ve never been a coordinator, and maybe I’m old school, but, if I was a coordinator, and somebody offered me a business card as a personal marketing tool for officiating - unless I asked him for it - I’d put it in my “Never hire this guy” folder.
Do your marketing on the field with hustle, paying attention, and making your presence with your actions. And, in the classroom by showing interest and scoring well on tests.
Save your money on business cards, and use it for travel, etc., to clinics.
Just me.
Robert