The best way, in my opinion, is to talk with native English speakers all the time and read well written English articles to get a feel for how the language flows.
Grammar is also important. Remember how to conjugate verbs and practice writing everyday. Although your English is rather bad, it's understandable, so it's enough for most people, but if you want to become fluent, study a lot.
Expanding your vocabulary is a must, and know when it is appropriate to substitute certain words for others.
For example, you established the fact in your first few sentences that "English course" was your subject, so you can replace "English course" with "it" or "that" depending on the context.
Most of all, read. Make note of how writers form their sentences and when they capitalize words.
If you have any other questions regarding this subject, you're free to contact me. :)
EDIT: My advice for you is to just keep asking questions and getting more information out of each and every answer. And don't forget to converse with English speakers all the time!
You can e-mail me at idkusernames@hotmail.com (or right here at Yahoo!) if you want to practice with conversation, grammar, or whatever else you need help with. Good luck. :)