Witnesses needed?

No. Generally you provide witnesses yourself. That can be each other’s best friend or some other close relative. Both need to be 18+ to sign legal documents.

You are responsible for providing your own witnesses. There are some companies out there who specialize in elopements though, who will oftentimes provide package deals (such as officiant, witnesses, bouquet, photography, etc). If you do not want to provide your own witnesses, id look into one of those companies.

If you're going to the courthouse to get married they might be able to find 2 people to stand in. If that's your plan, I'd call the court to make sure they could do that though.