replaster

Hi all, Have had stained wallpaper for the best part of a year now and decided to take the wallpaper off to see what I'm dealing with underneath (see attached photos). What would you folks suggest? Fill the holes and make good or remove all of it and replaster? It is in a living room so...

I just moved into a house that was built in the 1960s and one of the rooms has messed up plaster on it so i want it removed and new stuff on the bricks are red on the outside of the house. I think they are clay but idk. What surface do you think I will find once the plaster is knocked off and...