set up multiple websites hosted differently

I am a web designer. I just learned WP and would like to begin converting some of my non-profit clients to WP so they can do edits themselves. Not all of my clients are hosted at the same place.

They each have a different domain name and host.

I have downloaded WP to use for the class I took and hope to change over my own business website. How do I get a different Admin panel for each different client? I do not want them hooked to my Admin panel. I read about multisite plugin, but these sites are not sub-domains of my own.

I am a bit confused. Hope someone can direct me on this.

Thanks,

Helen