I would like to know about the origin of the English language.
You will find lots of good web pages about the origin of the English language simply by using the search terms "english language history" in any internet search engine. E.g. here is one thorough article on the subject:
If you would like to get more personalized answers to your question, I would suggest for you to turn to some "Ask a librarian" service in any English-speaking country. We Finns might not be the best possible specialists of the English language.