Thanks Medea for all the info provided, we really appreciate your help.

I apologise if I sounded offensive, that's not my intention, as I said it's quite different compared to other countries we've lived before so my brain didn't digest the difference well. We do want to follow the correct procedure but at the same time we want to do it in the most efficient way (time and money).

Now it's about preparing those documents... I will post any updates in case other people have similar questions like mine.