I am creating a join form for visitors on our site, and I'd like to give them the option of adding what school they go to. 

I've imported schools as organizations, and I think I know how to link individual contacts to "Student of.." the school when I import our list, but going forward how do individuals link themselves to particular schools when they sign up?

I'd like for them to be able to type in the name of the school and be presented with suggestions (to try and avoid creating duplicates with spelling differences). 

Any idea how to do it? Thanks!

I've got CiviCRM 4.7.25 and am using Wordpress.