Hello Hakan!
The "Walks" section of this website would be a good place to start. It shows all the different parts of Scotland, and some of the walks that can be done there. You can also see walk reports by users of this website by following the links.
What sort of place do you want to visit? Do you want to climb mountains, or just walk through valleys? I think a good place to start might be the Isle of Skye.
https://www.walkhighlands.co.uk/skye/It has a good variety of spectacular scenery, which you can see by exploring the link above. There's also something special about walking on an island.
The Cairngorms are perhaps the most similar to Sweden - the tops of the mountains are sub-arctic and even support reindeer. If you don't want to climb mountains, the valleys below give very nice walking.
https://www.walkhighlands.co.uk/cairngorms/Have an explore of the Walks part of the website, see which places interest you, then come back and ask as many questions as you want!
Also, here's a recent thread you might find useful:
https://www.walkhighlands.co.uk/Forum/viewtopic.php?f=1&t=90934