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how do i say the following if bulgarian?

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/ ;-)

:-)

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").