Basic requirements to get trained and started as a freelance writer
Language writing proficiency
You must be proficient in the language. While English language seems to be the most demanded language, you can start writing in the language you are comfortable in.
Earning range for freelance writers
You can earn at least $5 for writing articles of about 300 words. As your skill and quality increases, you may earn hundreds of dollars for writing content of thrice that word length or more. Take note that it is not only the length of the article that counts, but the quality.
What to learn
Things such as plagiarism, research, tone, search engine optimization, grammar, are some things that determine your worth as a freelance writer.