The answers to this are peobably around somewhere, but I ask anyway:
In which load order do I arrange the following files in the vanilla launcher? Dawnguard. esm - Dragonborn.esm - Hearthfires.esm - HighResTexturePack01.esp - HighResTexturePack02.esp - HighResTexturePack03.esp
Do I need ALL the esp. files? and Are there any files I am missing?

Thank you for your help

You've been answered in another thread.

Well, I am not sure I got the correct aswers. I have seen somone mentioned earlier that loading order does matter.
Are you a moderator???
If not, get down from your high horse and maybe try to provide an answer that could help..

No.

I'm a third party who has this thing against unnecessary duplicates.

Just deal with it