Best way to prep walls & ceilings that have cracks & lining paper?

I recently moved into an old terrace house and I'm about to paint it starting with the hallway and landing. I've painted a house before, but that was my previous house which was to be a new-build. I would usually repaint the walls white every few years. It was easy, and I never needed to use undercoat or spend hours preparing the walls as they were in perfect condition and already white. Now, things are a bit different with this victorian house I've just moved into. It hasn't been painted for quite some time, and it shows. What I can see so far are cracks, gaps, and it looks like some of the walls were covered with lining paper and painted over. Overall, the walls aren't shockingly bad so I'm pretty confident I can do this work myself. I can use the money I save to buy flooring to cover the horrible floorboards. My questions are: 1. Judging from the photos I provided (see link below), how would you best prepare/repair the walls and ceilings so that they are ready for primer/undercoat? 2. I want a matt white finish, this will match my living room. Would I need to apply primer and/or an undercoat to the walls before painting them? (They're already white) 3. What tools/materials do I need to buy to carry out this work effectively, specifically, tools needed to repair the walls? My current to-buy list looks like this: Paint - Dulux Trade Undercoat Paint - Brilliant White - Dulux Trade Vinyl Matt Emulsion Paint - Pure Brilliant White - Dulux Trade Quick-Dry Satinwood Paint - Pure Brillian White (Waterbased) Paint Accessories - Paint Bucket - Paint Tray - Dust Sheets - Paint Brushes - Rollers Wall Preparation Stuff - White Spirit - Putty & Joint Knife - Electric Sander/ Sanding Head/ Sanding Blocks - Caulking Gun Other - Ladder - Dust mask - Hawk I'm also open to suggestions/recommendations, i.e. quality paint etc. I'll be using the information that you provide as a quick guide, so I just want to say thanks in advance. Kind regards