Here's the secret that nobody will tell you — the only requirement for giving a talk is passion. That’s it. No diploma, no famous project, no masters degree, no nothing. All you need is passion.
Having 10 years of experience on something is nice, but don’t wait for it to get started. The best speakers I've seen are not the ones who knows all the in’s and out’s about a certain topic.
Your job as a speaker is not to teach, your job is to inspire action.