I starting my PhD, and I've already an idea of the topic that I'll be working on. So, I'm starting to read papers about my topic. I'm taking notes of the papers that I'm reading and writing brief resumes about that to not loose track of what I'm reading. Is this enough, or I should put this notes in the thesis that I'm starting to write? Does anyone have more advices?

You could use the reading you've done to construct an outline for your literature review, and perhaps write a few pages on the specific topics you're pretty sure you'll be looking at in your PhD?

Starting to write early is a good thing :-)