Dialog with morph targets (blend shapes)

Hello. Im still learning UE, Is there any tutorial about how to make a character talk? As far as I know It usualy done with morh targets. Since that i got lot of Qs:

  1. Can I add morh targets later to my character in UE? How?
  2. Is it possible to add m-targets without replacing\reimporting a whole mesh?
  3. How to animate the mouth? How do you do it? Do you just make morh targets randomly changing while audiofile with the speech playing? Is that right way?
  4. If previous is right so how to animate it over time in BP?
  5. Is there any step by step tutorial how to make your character talk (animations)? idk why Epic skipped so important topic…

Thx in advance.