My own skin care method

Today, I went to a new cafe in Tongchang with a friend and looked in the mirror under the bathroom lights. I was really shocked. I hadn't noticed it under natural light, but under the white light, my skin looked so puffy and dull. Honestly, I'd been making excuses, just using skin toner and lotion. But then I heard from the people at the next table that so many people were already meticulously taking care of their skin. I realized I'd been taking things too lightly, and I suddenly started feeling anxious. Now, I'm trying to create a systematic skin care plan myself, but which products should I start with? Should I focus on hydration first, or should I add a functional essence? How do you guys usually take care of your skin? I'd love to hear some valuable advice from those who have struggled like I have.