I used to srt a lot of this stuff out in a past life. To save you a ton of hassle i tank the whole lot out. You have signs of moisture on those walls and they will bite you later. In terms of ventilation, i will assume you have modern central heating in the house. You can minimise that a bit and get away with a couple of air bricks either end of the house. The breathable membrane is this stuff

Tanking Membrane 20m | Twistfix

you can use silver sided plasterboard straight over the top in battens and some thin insulation behind it. As for the floor above i would go for some insulation in between the joists and plasterboard over the top of that. The floor could be quite expensive if you want a good job done where you will need an epoxy dpm once you key the surface which would allow you to use a waterproof latex based leveling compound which you can add any type of covering you like.

Hope this helps