¡Muchisima suerte en regresar a la escuela!
(Good luck in returning to school.)
I think it is great that you have decided to go back to school. I truly believe it is never to late to learn new things. My mom stayed home with my brother and I until we were grown. She went to college at age 40 and got her Bachelor's Degree. She even graduated top of her class!! Now she is a high school computer teacher and is currently working towards her Master's and she just turned 52 this year.