The fixative I use is of the brand Schjerning "lugtsvag Fixativ!.
It's the best one I have tried yet. It doesn't smell as bad as many fixatives does and I find it great.
There's most likely a lot of great brands out there in your country.
Always remember to spray your drawings in a ventilated room or outside if possible to avoid inhaling it.
I store most of my drawings in binders/folders, protected by plastic bags.
This way they are protected from dust and sunlight.