The author only needs to write according to the formal paper format: title, abstract, key words, body, conclusion and references. You can use word, and you don't need pdf format or columns. There will be a special editor in charge of these jobs, and no matter how well you arrange them, it will be useless. You only need to write articles line by line and paragraph by paragraph in word. The most important thing to contribute is to choose the right magazine, that is, it must be a regular periodical, above the provincial level. The second is to choose the right channel, and the same magazine channel charges differently. Many authors contribute their own articles, either because the magazines they choose are useless or because the fees are higher than others. If necessary, I can help you recommend articles to regular journals.