Stripping off old painted lining paper and my walls have the remains of the old paint  on the plaster, what is my best way to remove all of this? as im worried that it will show through when i just paint directly onto the wall. you can feel it when you rub your hand over the wall. dry sanding it will create loads of dust. i did think about using a red scotchbrite and wet sanding it.

sorry about the basic decorating question, i did google it.

crap walls really ping my OCD so they all have to be mint.

Dry sanding with dust collection is your best bet, if you wet sand plaster it will run down the wall and set again. You can hire dustless sanding machines also called drywall sanders.