The Teacher Student is one of my favorite opening mantras because it sets a nice tone for practitioners new & experienced.
Om Saha Nau-Vavatu
Saha No Bunaktu
Maa Vidvishaava - Vahai
Om Shanti Shanti Shanti
Om, May God protect us both/all (teacher and student/s)
May God nourish us both/all.
May we work together
May our intellect be sharpened (may our study be effective)
Let there be no animosity amongst us.
Om Peace, peace, peace.