Here are videos to show you how to pronounce the different sounds in English. The site is very clear and can help you pronounce those new difficult sounds.
Hundreds of free exercises to learn English online. Give it a try and improve your listening skills. If you are nosy, why not try other sections on the site? http://www.agendaweb.org/listening/elem_interm.html
This is the link from BBC learning English to practise the pronunciation of these three sounds. The activities are fun. There are a lot of examples to do.