Good morning, my name is Dany and I read through your description. I am from Luxembourg and have excellent skills in German and English. I agree that 1:1 translations are not always working according to the context. It is something that I always take into consideration.
1) How many years of English->German experience do I have? Well, let me formulate it like this: Basically since I learned English at school, I always did some translations from it into German, be it for my mother, for my work, in private, for my wife, etc I always did it and can without any problem switch from English to German and vice versa.
2) When would I be able to start? I can start tomorrow, after knowing exactly what is awaiting me.
3) One of these documents will take I'd say a few hours, to make it really good. Quality needs time.
4) According to the vocabulary somewhere between 50-75 Euros.
For further information, feel free to contact me. Best regards, Dany.