My methodology composes of teach specific themes for companies and students about all the language. I think that the point of view of a native it's a good start to understand any language.
About the contents, I don't have an specific content, the student tell me the topic and the questions, and I resolve it all with a dynamic examples and exercises to practice these specific topic.
My experience like a teacher is short, but it's good because I like this job, so I explain the contents with the more emphasis that I have, since the question to the understanding of the student.
By the companies, I can teach all the concepts that you need for conferences, explications, etc...
Include by subjects of science I can explain it in spanish and english.
About the spanish, I think that it's an easy language if you can understand since the start basic concepts... Like when you must to put the accents, type of words, the gramatic is easy, the vocabulary is extensive, but I solve this problem give to you many synonims for an only word, to enrich the vocabulary. It's important to mention the hours.
I organize the class during monday to saturday, the hours depends of my job, but I can be flexible to adapt me to the hour. On saturdays only at the morning, since nine to eleven.
Now I can teach online, because I'm living in Spain, but in few months I will go to London and I activate presencial classes too. Have a nice day ;)