Ok I'm gonna write this down in both Hiragana/Katakana and Romaji for my own sake.
あら、 ありがとございます!
さて。
はじめまして。
ぼくは戦士です。
オランダからきました。
私は中学を卒業しました。
わたしの趣味はテレビ下エムと映画と音楽です。
どぞよろしくお願いします。
Ara, arigato gozaimasu!
Sate.
Hajimemashite.
Boku ha Senshi desu.
Oranda kara kimashita.
Watashi ha chuugakkou wo sotsugyou shimashita.
Watashi no shumi ha terebi geemu to eiga to ongaku desu.
Dozo yoroshiku onegaishimasu.
Oh, thank you!
Now.
Nice to meet you.
My name is Senshi.
I'm from the Netherlands.
I've graduated from middle school.
My hobbies are video games, movies and music.
Please be kind to me.
What a relief that I was able to put this down here, if there's any mistakes, tell me.
P.S. - I thought of putting it down in English so that you would understand what I was trying to reach here.