You can't make or send totally "blank" vCards. Some information in them is necessary.
But since you are referring to "your contacts" I suppose you have some info of them already, and if it's only their name and email address (how else could you send them anything...).
So then, take their present vCard you have of them and send it to them asking for verification and completion:
- In Contacts, either export all your contacts as vCards, or drag and drop one by one onto the desktop or into some folder.
- Compose your email and attach the vCard of the recipient. Most people will be absolutely able to open it, see and complete it, then save it and mail back to you.
When you get them back and drag them onto Contacts, you might create doubles, but deleting the old one is as simple as selecting it and hit the Delete key (or Fn-Backspace).