Project management: Anyone know how to start in this field?

Hello, I've been assigned as a project manager for my company for a few projects, and it's tertiary to my main job. Thing is, I really like project management, and I want to do more. I'd like to make it my full-time thing, it's interesting, keeps you occupied, etc. I'm rather young (26).

Any advice? I know this isn't strictly entrepreneurial a question in nature, but I figured people here would be the most knowledgeable on this.

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