"I want to know how to speak English well. can I do?" Bill asks this question like many students do. I ask(he),"How do you learn English?" He (answer),"Only in English class." first thing I will say is, "That is not enough!"
If you want to speak English (good), you have to practise. Speak to friends, classmates, people online or in stores. Speaking is the best way (learn) a language.
In my class I usually ask my students how they feel speaking English, and they often say "nervous", "scared" or some words like these. The (two) piece of advice I can give is to relax. Don't worry about making (mistake). If you can't think of the right word to use, don't worry about it and just say what you want to say.
Speaking English well isn't just about practising your (speak). It is also important to listen to English. Listening to the English songs and English tapes is helpful.