Protruding nails and remove bits of what they are. Fill any holes or cracks with a good quality filler, let it dry and sand smooth. Rub the doors with a solution of sugar soap and water, or hot water and detergent if you do not have sugar soap. Make clean ‘em principle. Vacuum. Yes suck all the dust and bits so that they are completely gone. There is nothing in the world of decoration more than annoying to see bits of stuff all over your new satin-finished woodwork. o vacuum. If you do not use a vacuum cleaner, ask your other half. You will know. If it does not, you probably will not civilized enough to do painting. Watch telly instead.
With a one-inch, a one-and-a-half-inch or even (max), a two-inch brush, a good, complete coating of acrylic primer undercoat (quick drying) on all woodwork, with smooth apply , even strokes. Do all the woodwork except the actual door. We will get it in a minute.
When it is dry (one hour on a warm day) do exactly the same with your top layer, which probably are a white gloss. Smooth, even strokes remember. Use enough paint, put on a good coat, but when it runs for a few seconds, you’re too much. In fact, why not something like Crown Non-Drip-one coat? A fantastic product. Can not go wrong with it.
When it’s done. Leave it alone, do not mess with him. any remedy can be done when it is dry, be (about five hours in a warm room or whatever it says on the tin).
The door is another matter. I prefer a mini foam roller and a mini roller tray and place on several layers. This also applies primer / undercoat and gloss. Use a different role for different colors of course. Throw away the rollers when you are finished. Wrap the bright roll in a plastic bag between the layers. You probably need three layers of gloss, because it will not go too thick, but to give a nice finish.