Respondo sus preguntas :)
HOW MUCH WILL IT COST?
Rates vary depending on a number of aspects: type of work, document format, quality of the document (is it clear? was it scanned from a book? In case it is a subtitling or a transcription, is the audio understandable? Etc.), complexity, volume, tasks involved, whereas it is an urgent project or not, and so on. I can provide a quote only after seeing your files.
AM I AN INTERPRETER?
No. An interpreter is a person that works with oral speech, spoken words, whereas a translator, which I am, works with written texts. I do not do interpretations.
DO I TEACH ENGLISH?
No. Since I am not a teacher, I do not posses the abilities and tools to teach English. I do not give classes of English.