Beginning the fast

There is no specific prayer to begin a fast in the morning. The intent or niyyah to fast is in the heart and that is sufficient. One can pray in one’s own words seeking Allah’s help to be able to fast and spend the day that would please Allah.

Prayer on breaking the fast

اللَّہُمَّ لَکَ صُمْتُ وَعَلَى رِزْقِکَ أَفْطَرْتُ

Allah-umma laka sumtu wa ‘alaa rizqika aftartu

O Allah, for Thee I have fasted, and with Thy provision I have broken my fast.

source https://www.alislam.org/articles/prayers-beginning-opening-fast/