ё is pronounced "yo" as in yo-yo (the toy) and it is always stressedOriginally Posted by Chibi
я is pronounced "ya" as in yaba-daba-doo (from the Flintstones)
щ is pronounced like "shch" as in swiss-cheeze
Here are some audio examples of Russian greetings.
http://masterrussian.com/blday_greeting.shtml
Hope this helps