How to join the nightwatch?

[Madis]

I have talked to the "king" of night watch. He told me to "Get your bearings in the yard." What`s that supposed to mean? I`m sorry if it`s a stupid question, but English isn`t my 1. language so I might have understood something wrong. By the way this mod is great. I love it.

Thanks.

[Produno]

A dialogue option opens when you speak to him to allow you to join them.

[Matthew]

Hi, not sure if this is a bug so I decided to post it here as its also to do with joining the watch.
when I went to ask to join the watch I thought it would mean me being taken on as a soldier in Mormonts army? Not sure if that's whats meant to happen but when I accept and join the watch and he says something like '' wel start you off as a trainee'' , I  become a vassal of the nights watch instead , and also im not given a fief , which just sucks. Is this meant to happen or is this a bug because I would really like to start off and gain my way through the ranks to become a ranger.
Thanks matt.