Here are some short phrases for you to try.

Zdraveite = Hello

kak ste = How are you

moje li smetkata =Can I receive the bill?

blagodaria = Thank you

kolko e chasat = What`s the time?

dobro utro = Good morning

dobar den = Good afternoon

dobra ve4er = Good evening

leka nosht = Good night

dobre doshli = You are welcome

az se nadiavam = I hope

molia = I beg your pardon

izvinete me = Excuse me

sajaliavam = I am sorry

kakvo = What

kak = How

kade = Where

chestit rojden den = Happy Birthday