Migrating a static website to a WordPress blog, and consolidating additional WP blogs into first blo

To whom it may concern:

I currently have a static website (with linked Blogger blog), and two WP blogs. All three properties exist as separate self-hosted domains.

Is there an easy way to migrate my website to a WP blog, changing its theme in the process??

Once migrated, I’d like to consolidate my two other blogs into the first blog. Would I need to think of them as separate Categories??

I mention Categories because I’m thinking of a theme that would list (or showcase) different categories as separate entities.

Thank you for your help in this matter.