One way to become a better writer is to read a lot. When you read a range of books, you can learn from different authors' styles. You can see what sort of words they use and expand your vocabulary and knowledge of English. You can also do research about writers on the internet or from books. When you have collected enough information, you could write a profile of the author.
If you are lucky, you might even meet an author. Sometimes, when authors visit schools, you can conduct an interview with them. Before talking to an author, it is a good idea to prepare a list of questions to ask.