Depends on person.
I advise you to complete Tae Kim first, then pick up something else (I started reading). Check out this list
I personally recommend https://bunpro.jp/ as a grammar revision/studying resource.
I guess it can improve your listening comprehension but i’d rather find a partner for speaking. Also there are a lot of resources for that purpose (i.e listening) which would be more useful than anime.
Can’t remember. I just love the language
P. S: My london is at school level, sorry for mistakes