Mr/Ms Pasta (spaghetti English): Your English is just fine.
A '50' for a Nikon means getting a Nikon lens, unless you find one of those Russian 50s that will also mount (as they made SLRs with that mount). WHICH lens you want is determined by what you want to occur with your SLR. If you take the easy (piu facile) route and get a Nikkormat you will not have automation but you will be able to use any Nikon lens, old prong-type or newer AIS type, without any problems (other than meter readings with other than 'prong' type lenses).
In recession-prone Europe you should be able to buy a working Nikkormat body for less than 30 Euros. The Nikon lenses are quite expensive, however, and, where 50s for Minoltas, Pentaxes, Canon (FD), etc can be had in the USA for $10 to $20, the cheapest Nikon (Series E) would be maybe $40. Thus, with the exchange rate as it is, that 1.8/50 Series E would cost you about 30 Euros. It is a VERY sharp lens. I promise you that you will not see a difference in image quality. If you need to use the (working?) meter, however, in that Nikkormat, you will have to get an older 'prong' type lens that meshes with the protruding, moving lever at the top of the camera mount area. (Set the lens at f5.6 to allow the connection to occur.)
Of course you could consider other than a Nikon body: the other brands I just named are as reputable as is Nikon.
With regard to baachitraka's comment: Choosing a focal length is determined by both personal desire and need. A '50' might be 'boring' to many but that is the focal length used in the vast majority of photos; it imparts a normal perspective on what you are viewing. I would use a '50' as a standard and then deviate from that as the need manifested.
Nella vita a volte ci sono troppe scelte. (Io sono la metà della Sardegna. I miei nonni materni erano di lì.) - David Lyga