1 - Should I start reading the manga?
Yes

2 - Where can I find it in sweden (live in lindome 10 km from gothenburg)?
Just Download it from the manga section at narutofan.com

3 - How much does it cost / is it worth it?
it's free.

4 - Isn't it corny reading manga??
Isn't it corny asking stupid questions when you know how 95% of the people will respond?