St. Louis Marie de Montfort composed this short prayer to Mary as a way to unite your intention with the whole Church before beginning the Holy Rosary.
St. Louis de Montfort’s Prayer to Mary
I unite with all the saints in heaven, with all the just on earth, and with all the faithful here present. I unite with you, my Jesus, in order to praise your holy Mother worthily and to praise you in her and through her. I renounce all distractions which may arise during this Rosary. I desire to say it with attention and devotion as if it were the last of my life. Amen.