Eden wrote: if i wanted to say, I'm angry at _____. would I say "_____한태 화났어." ? ( my spelling is probably off) such as ' I am angry at myself' would be '나한태 화났어.'?
Yes, you can say like that.
___한테 화났어 is the right one though.
Eden wrote: Also, how would i show possession in a sentence, such as 'This is Eden's notebook' or 'This is Helen's dad.'?
You could use '의' in general.
This is Eden's notebook.
> 이것은 에덴의 노트북이에요.
This is Helen's dad.
> 이 분은 헬렌의 아버지예요.
However, there are several ways showing possession in colloquial speaking.
This is Eden's notebook.
> 이건 에덴 노트북이에요. (to omit possessive particle)
> 이 노트북은 에덴꺼. (에덴의 것 originally)
This is Helen's dad.
> 이 분은 헬렌 아버지예요. (same with above; to omit)
> 이 분은 헬렌네 아버지예요. (very colloquial)
Hope this helps.