Read out loud! If you aren't sure about the pronunciation of certain words, look those words up on Google Translate. The only way to speak more fluently is to constantly converse in English, this will help you speak more smoothly. That is what us teachers at Italki are here to help you with :)

Regarding intonation, Suzette Haden suggests using a recording of someone's voice and repeating along with them as they speak. So whenever you hear someone talking like you would like, you can rewind the video/audio and do that.

Thanks for your advise , Lincoln.

While I'm not too far along in my language learning process, I've read a lot and listened a lot to more experienced learners who have said that music can help with pronunciation/intonation/accent reduction. Apparently it helps us to imitate sounds. Because you are learning such a different language from English, I would assume it will take a long time to reach native fluency. Again, this is NOT coming from an expert.