What you said was i study taco after guitar, this would be easier if i knew what you were trying to say. You could say i study tacos after a play the guitar: yo estudio tacos antes yo toco guitarra or i eat tacos after i play guitar; yo como tacos antes yo toco guitarra
Contrary to what the other person said, toco does NOT mean taco! Your sentence says "I to study I play after the guitar." It should read "Yo toco la guitarra antes de estudiar" which means I play the guitar after studying.
