Painting new plastered rooms

NovicePainter

I know this question has been asked before, but I am still unclear on the answer for my situation.

I have some newly plastered rooms (ceiling and walls) that need painting. All plastering is on top of plasterboard. I have never painted on newly plastered walls so have some questions.

I was intending for the top coats to be in either Dulux Matt, Dulux Endurance Matt on the walls. For the ceilings then I was originally thinking it was best to use a non-drip formula such as Dulux Solid Emulsion.

I understand that I can't paint directly onto the plaster with such products, and that I either need to use a mist-coat or a plaster sealer.

My questions are:
1. If I were to use Dulux Plaster Sealer (which on the dulux paints I've mentioned above is the suggested sealer) then how soon can I do this? The recommendations seem to wait for the plaster to be fully dry. I have seen mention of waiting around 3 weeks, up to waiting for 6 months before painting - how do I tell which case to use?
2. Instead of a plaster sealer, a mist-coat appears to be what is used by alot of decorators. And I've seen suggestion of using Dulux Trade Super Matt watered down for this.
Is this the prefered paint to use for a mist-coat?
If its used, then can I apply the Dulux paints mentioned above as a top coat or do I have to stick to trade paints to cover.
3. Is their any benefit of either the plaster sealer or the mist-coat approach. We've had quotes from decorators who state they will do mist-coat, but why do the Dulux products promote use of the plaster sealer?
4. For the ceilings if I were to use super matt for the mist-coat, can it also be used for the top coat. Would this be more sensible than applying a Dulux Retail paint such as the solid emulsion? Are there benefits of using the solid emulsion?
(I've used a ceiling paint before in the past with successful results but can't remember the brand or if it actually did drip less than normal paints).

Sorry if this has been answered before, but completely confused on what to do, we would like to do the paint job ourself to save some pounds.

ewcs

If your waiting 6 months to paint plaster on board thats way excessive, 6 days max and then you should be able to paint it.
I always mist coat the plastered areas in the colour the walls are being finished in, Dulux etc are way to expensive, get a colour chart and take it to someone like Leyland Paints, they will match the colour you want at a third of the price and no difference in the paint.