Translation of Kostenstelle

I try to learn English as much as possible so that I can travel next year to the United States. I would agree to your proposal but I also need to find good teachers. My goal is quality and speed.
I have not received your contact request at MSN yet, but I will look it up tonight. My user name is the same as it is here. What it your user name there, also the same as on this website?
If you're still interested in our agreement, I will be glad to continue to correct your letters and essays. Write it in English, if you do not know a particular word and I'll translate it.