If you compare with the same question that you posed in Spanish version (your native language) as given in, http://www.italki.com/answers/question/65069.htm , i.e., "¿¿ Alguién me puede enseñar alemán, y a cambio, yo (lo) enseño español perfectamente ??" Then, you may see that the English version of your question needs to be somehow modified, perhaps as, "Can someone teach me German, and in exchange, I teach (him/her) Spanish perfectly??" In this case, the readers would possibly understand it better. Well, as suggested by other members, my opinion is that you should consult through the section of the "language partners". Good luck, and good day. / Buena suerte, y que tengas buenos días. / Viel Glück, und schönen Tag.