If you wish to attend beauty school, find out when the school is accepting applications. Many schools offer applications throughout the year, others only do so during the fall and spring semesters. You may have the option of joining mid year, though.
Many students that enter beauty schools have the ability to specialize in one program or another. Its up to you to determine what the right course of action is for you. If you want to specialize in a program not offered, find a beauty school that does provide for this.