There are plenty of ways you can promote your online training business.
Of course, mostly you would be thinking about various online channels – like via social media, writing articles, press release, joining online discussion forums, or maybe even display ads on relevant websites. These are all very necessary tactics, and if you want to learn more on how they are done, you can check out our online marketing services. http://www.fatbit.com/digital-marketing-solutions-company.html
Now, since your business is a learning/teaching platform and primarily your target audience is student (& tutor as well), you would also need to do some ground work, like going to school/colleges, telling them about your platform through posters, pamphlets, etc. (I am mentioning these ideas, since I have no idea about your business’s state, so maybe these ideas may seem a little old school to you.)
Anyway, if you need more advice on that, feel free to drop a reply.
Happy to help.