Hi Bjarni, welcome back to Fanfiction.
Here's a few tips.
Write your fic beforehand in word first and use the spellchecker to go over your work.
Whenever someone new is speaking, use a new line.
I won't give you many suggestions this time around, because if you give too many in one time you won't take it in. Try to do those two things first for your next chapter. Then we'll work on some more grammar skills.