Aside from what Keres said (those addons are pretty standard) there’s a few things I’d like to know before recommending anything.
What content are you doing? Addons for arenas are different to addons for raids are different to addons for questing are different to addons for bank alts.
What sort of person are you? Do you like your user interface to be perfect, with everything designed and laid out just so with aesthetically pleasing colours. Are you a minimalist? Do you want every possible thing shown to you all the time? Do you just want visuals or are sounds important to you?
Your answers will change what addons are recommended.