I was school in Junior High School

you could say: hola, me llamo... my name is... tengo (20) años I'm 20 years old estudio... I study ... yo soy de... I come from... I guess it depends whom are you talking to

Hello Dhea, Some phrases you could use for self introduction in Spanish language: Mi nombre es (Me llamo) ....... My name is .... He completado mi graduación en...... I have completed my graduation in .... Tengo X años de experiencia laboral como un .... I have X years work experience as an ......