Start with this Du'a
On slaughtering a sacrifice
بِسْمِ اللَّهِ وَاللَّهُ أَكْبَرُ [اللَّهُمَّ مِنْكَ وَلَكَ] اللَّهُمَّ تَقَبَّلْ مِنِّي
Bismillahi wallahu akbar [Allahumma minka wa lak], Allahumma taqabbal minni
“In the name of Allah, and Allah is the Greatest. [O Allah, it is from You and for You.] O Allah, accept it from me.”
Sahih Muslim 1966, Sahih Muslim 1967, Sunan Ibn Majah 3121 (hasan)
Said at the moment of slaughter. The Prophet ﷺ asked Allah (SWT) to accept his sacrifice from himself, his family and his Ummah, so one may name those the sacrifice is for.