would like to live near to my fiance's family near Głogow
I lived in Glogow last year! There isn't much to do around there! A couple of language schools which have natives (If you want to teach) In regards to KGHM in Glogow, they have a highly experienced translator who has been working for many years, so they don't have much need for a native. If you can speak German i would look at VW Polska in Polkowice.
I have nothing bad to say apart from the lack of communication with natives and lack of drinking buddies :) But its OK generally :)
If you want to stay near Glogow, but want the city feel, i would look at Wroclaw (90min drive)
If you want any information, schools to avoid etc, i still have family and pop back quite often and of course you can PM me :)