I'd love to visit Sweden someday, it's also close to Finland and Norway, places I'd like to see too, so it's the perfect destination to knock them all out.
i always wanted to visited that region of the world
It seems like a great place to visit in the summer, as it has warm continental summers and the overall climate is generally very mild.
do they speak the same language?
Well the official language of the Kingdom of Sweden is Swedish, but I imagine many people there are well-educated and know some English too.
I think I would visit Sweden first and then Norway.
That seems like a good plan, then after you can visit Denmark which is connected to Sweden by a bridge-tunnel in the southwest.