Hello Vika and welcome to this awesome community! It's great to see so many people here who are also interested into learning English. I'm here as well to improve my English every day.
I wish you a lot of fun and success out here. If you have any questions or need help within the platform feel free to ask. I'm always willing to help :)
I do not know where to start, what to write about, and how to make sure that the article is supported?
Well, I suppose you write about your interests or simply about you daily life. The most important thing here is to be authentic and to give value to the community. At the beginning it may be hard to catch some attention and get support from the community. To be successful you need to work hard and be consistent. Using all available tags and especially the correct ones which reflect your content the best is also very important to be found here.