Ceiling paint, and brand name paints can be expensive.
I would suggest, buckets of white cheap and cheerful, thin out 10-15% and coat not just the ceiling but the walls as well. Acts as a sealer , will reduce dust, allow imperfection in plaster to be noted and filled , touch up the filled areas and then use your intended finishing colours.
Most people try and get away with 1 or at most 2 coats of emulsion.
new plaster really needs the primer/sealer coats plus the two top coats.
Stick to Matt emulsion for the first decoration, dot try to use silk or sheen for at least 12months, it will blister and lift.
also woodwork, if priming be sure to use Knotting on the knots prior to priming, ( pour on to a handfull of cottonwool, wrap in a cloth and dab on knot extend out by at least 50% the area of the knot/resin)
Best of luck