How do you ask which station in Japanese?
I want to be able to ask at which station I need to get off and then I am talking about the number and not the name of the station.

So sentences like: you need to get off at the seventh station from here.

How can I ask a question which results in this answer?

I usually ask: koko kara nan me no eki desu ka? But people apparently do not understand me. So my question is not completely correct I guess.

Question

How do you ask which station in Japanese?
I want to be able to ask at which station I need to get off and then I am talking about the number and not the name of the station.

So sentences like: you need to get off at the seventh station from here.

How can I ask a question which results in this answer?

I usually ask: koko kara nan me no eki desu ka? But people apparently do not understand me. So my question is not completely correct I guess.

Answer

Your sentence is almost right. 
Say this next time.

koko kara nankome no eki desu ka?

Answer

(name of the station) wa koko kara nambamme no eki desu ka? 
Try this next time, hope you'll make.

Answer

The best answer comes from Ryoko san :D. Woow that is very interesting.

Why is the counter for eki actually with "ko". I thought that ko is a counter for small things like eggs, apples etc. For big things I learned dai.

Answer

For this type of "nan ... me", we have to use the Japanese counter between "nan" and "me". In this case, you can say "nan ban me, nan ko me, ikutsu me, nan eki me", however, I rarely use the last one. Good luck to you!