Translation of offender in Spanish

I usually charge 15 dollars per hour, but I don't care very much for the hourly system. I can also help with corrections and suggestions, but only if the original text is a serious translation and not an automatic one.
I would also need to know whether pricing can be different, because otherwise that amount would be too high. Some of the translations are not accurate at all and would also need corrections so that the dictionary displays only correct words.
I am a kindergarten teacher for children between age 4 and age 5 and additionally I teach at a school here in Munich: music, painting and handicraft. At the moment just we have holidays.