How to Say "I'm going to buy roses at the flower shop." in Korean?

"I'm going to buy roses at the flower shop." in Korean is 꽃집에서 장미 살 거예요. (kkotjjibeseo jangmi sal geoyeyo)

생일 파티 (saengil pati) - Birthday Party
다음 주에 엄마 생일이에요. (daeum jue eomma saengirieyo) - Next week is my mom's birthday.
생일 파티 준비해요. (saengil pati junbihaeyo) - I prepare for the birthday party.
생일 파티 준비해야 돼요. (saengil pati junbihaeya dwaeyo) - I have to prepare for the birthday party.
꽃 사야 돼요. (kkot saya dwaeyo) - I have to buy flowers.
예쁜 꽃 (yeppeun kkot) - Pretty Flowers
예쁜 꽃 사야 돼요. (yeppeun kkot saya dwaeyo) - I have to buy pretty flowers.
엄마 꽃 봐요. (eomma kkot bwayo) - My mom looks at flowers.