Hi! If I were to re-write this introduction, I'd do it this way:

Hello. Basicly, my name is Even and I'm 15 years old. I'm from Norway (if you put the three things in one sentence, it would be what Americans call a RUN-ON SENTENCE). I want to learn Japanese, but the main thing I want to do is teach other people my language, which is Norwegian. I do it seriously, over msn or skype, with or without videocall.

If you ever need help, I'm here, seeing as I've taught English before and want to be an English teacher, so I can help you with grammar. 

Also, I'm fifteen! Nice to meet you!

First notebook entry: Introducing myself

Hello :3 Basicly, my name is Even, and im 14 years old from Norway. I wanna learn Japanese, but the main thing I wanna do is to learn other people my language, Norwegian. And I do it seriously n_n Over msn or skype, with or without video-call.