To open a textbook.

Best thing to do is start on the basics like the alphabet and then find a language partner who wishes to learn your language or better yet, a person who knows your language well and can help you fully.

I think first step is your interesting to know English.

I think the first step has been made since you know a lot of English by now. But if your wondering how to improve and you don't live in an English speaking nation just get a pen-pal this site is good. Or go to youtube or the web and search for how to speak like a native, pronunciation, accent reduction etc. and practice.

给你一个参考信息，一个非常牛的韩国人学习英语的经历：千万不要学英语。你有空去看看吧，也许对你有用。 http://www.docin.com/p-10575218.html