seriously do you think someone just wants to up and pay you money so they can talk to someone with no idea on how to help them improve their functional english?
You should be looking to provide a service which delivers some value to the customer or client.
Ask yourself what kind of retention rate you can expect with what you know now. Who would your client base be if you intend to rely on private non-contractual learners, and what kind of language development they would be looking for within the confines of the english language.
before i get any hilarious replies about any spelling mistakes etc etc im typing this as quick
a spelling mistake is when you mispell a word by a letter as opposed to
when you exhibit such poor spelling that it leaves one questioning if you even know whether the word in question is a noun, verb, adjective, adverb, conjunction, etc.
Try to get some qualifications or experience now and you'll come away with a much greater chance of success at providing a service which will be worth what you demand.
I know that's harsh but guys come here all the time with their polish birds and seem to thing "oh great they're gonna pay me to talk" and just come away looking like clowns.
So to answer your question, should you decide to get some sort of qualifications or training then that would undoubtedly lead to the contacts (institutional or otherwise) you seek.