How can I clean and build a professional digital footprint for my PR job search?

[JohnVR]

I'm a recent graduate starting my job search in the public relations field, and I'm realizing my digital footprint is a chaotic mix of old social media posts, a sparse LinkedIn profile, and some unprofessional usernames on various platforms. I want to proactively manage my online presence before recruiters start looking. For professionals who have successfully cleaned up or curated their digital footprint, what's a practical step-by-step process? How do you effectively find and remove or bury old content, and what tools or services are most reliable for monitoring what's out there? Beyond just cleaning, what positive content should I be creating on platforms like LinkedIn or a personal website to build a professional brand from scratch?