[Protronie]

I would say, " You bring what you know, and a willingness to learn, and we'll help you. Then break it down to something I'm sure that would understand like joining a football team.

You start out knowing little or just the basics... and through practice and drills you become a player.

Also assure them that nobody on the team will look down on them and everyone willing to teach them something.
Don't forget to mention that theres a job for everyone on a team.