Shutting down a company (I will not promote)

I'm looking for advice on shutting down a Delaware C Corp that is behind on compliance requirements. Many years ago, my co-founder & I had started a Delaware C Corp. It didn't go anywhere and the they decided to transfer all stock to me. I continued for a little while and generated some minor revenue. I had Gusto set up so I think I'm fine from a compliance point of view. I'd like to shut down the company. How can I file the necessary annual reports and such to close down the company?