Let me work you through this step I am using to be a professional trader
1. Learning on YouTube and other PDF resources online
2. Attending conferences and watching trading podcast
3. Find a mentor, whether offline or online. You may not be close to this person but always study his trade
4. Practice always and maintain consistency
That's the spirit, I learned how to trade myself without paying a cent to anyone and I've ever encouraged people to do so. But whether we like it or not, it's not everybody that can yield to this advice. First, some people do not have the Will to do it and when they want to force themselves to do it, they may not have that Zeal.
Also, some people do not have much time to surf the internet and search for various resourceful books and articles about trading. This could be due to their work and other engagements that cause a tight schedule. It might be fine if they go straight to the point, and having the right person to point them in that direction is always their option and could be the best decision, and it is fast at the same time. Above all, if one can afford the external teaching, why not, but the teaching must be such that is worth it. That's my only concern here.
About your points above;
1. This is good but I prefer the PDF and other written articles. Nevertheless, it is always good that the ones needing practicals are decisively practised by the learner.
2. I don't buy the idea of the conferences, or do you mean to say trading seminar? If that is it, then it is good. Webinar is also very good as I've learned one or two through both.
3. Do you think the mentor will reveal much without you paying? I don't think so.
4. This is the most important part. You do not just learn from people, you practice what you learn and that's what inculcates experience in us. And through this, you may even modify/advance on them to know better than those who taught you if you are smart.