Präsentation: Bitte Text über "Titan" kontrollieren

Hallo, ich muss eine Präsentation in Englisch halten und habe wirklich immer Probleme wegen der Grammatik. Ich habe unten einen Teil meiner Präsentation aufgeschrieben, bitte nimmt euch die Zeit und kontrolliert ihr für mich denn es ist wirklich wichtig für mich( PRÜFUNG). Bitte achtet nur auf die Grammatik Fehler!


Hello i want to give you a short presentation about Attack on Titan. I structure my presentation in 4 points. At first.......
And now the Story arcs. The first story arc of the Attack on Titan Story is the Fall of the Wall Maria arc. In AOT was the humanity destroyed by titans. titans are nacked giant figures and they are 3 to 15 meters big and they eat people without a reason and because this built the people 3 walls. The name of the first wall is maria the second wall is rose and the last wall is sina. The live now inside this walls. The main character in AOT is Eren. He lives with his parents inside the first wall Maria and he has never see a titan. But then change everything, because a titan who is bigger than 50m comes and destroys with his foot a part of the first wall and then come many titans inside the first wall and start to eat the people. All people are shock and afraid and they run but they dont have chance because the titans are too fast and too strong.
AND NOW THE SECOND PART OF THE STORY
and this is the Trainings arc. Eren has survive it and now he lives inside the second wall rose and then after 3 years he joins the military to become a soldier because he wants to revenge the death of the humans.
All soldiers in the military have to learn to use the 3d maneuver gear because only with this equipment can a soldier kill a titan because a titan has only one weak spot and this is the neck. they can only die if a soldier cut the neck of them.

Das ist jetzt der Teil meiner Präsentation, der sehr schwierig für mich ist. Bitte kontrolliert ihr und achtet nicht auf die Rechtschreibung, denn ich sage dass ja und schreibe es nicht auf. Also achtet bitte nur auf die Grammatik Fehler!
Danke schon mal.