How to redirect my old WordPress site to my new one?

Hello!

I’m renaming and rebranding my site, and I have set everything up at a new URL (self-hosted WordPress).

What’s the best way for me to automatically redirect anyone arriving at my old self-hosted WordPress site to my new one? Is there a plugin that will do this?

And is there a way to specify that certain of my “pages” from the old WP installation should redirect to specific NEW pages on the new site?

Thanks!