Hi, I suggest this free online Talking English Pronunciation Dictionary - simply mouse over your entry to hear it pronounced. American and British spellings, with alternatives. www.howjsay.com

Repeat after the audio clips you hear, listen carefully and mimic the words and intonation. Use any kind of voice recorder to record your voice while you are speaking, practising. Play back, listen to yourself and make adjustments if needed. As always, practice makes perfect.