One more thing. You can actually use "merci" instead of "blagodarya". It is used very often, also in combinations such as "mersi mnogo" (thanks a lot). Just make the "r" more pronounced, as in "trill" (as opposed to "tire").

hello - /zdravei/(informal) or /zdraveite/(slightly more formal) how are you - /kak si/ (informal) or /kak ste/ (formal) i am fine - /dobre sam/ ("sam" would sound a bit like the English "some" - in English there's no total equivalent of the sound or of the letter with which it is written) thank you - /blagodarya/ (the stress is on the last syllable) and a bonus, please - /molya/ ;-) :-)

добро утро - greetings добър ден добър вечер как сте? - how are you? Добре - well Благодаря - thanks