I am one of the co-founders of Skillshare, which is in this business (though not for finance and trading areas).

Your question is a bit vague, so it depends on a lot of specifics. How are these classes "delivered"? Who are your target customers? Are you looking to be more of a content provider, or a platform, or..?

Depending on the specifics, you could either start your own site, and host your courses there.. or simply distribute and syndicate your content elsewhere.

Happy to help if I can if you want to schedule a call.