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It depends on the type of paint used in the existing painting. If it is an oil painting, you will need to use oil based paint. If it is a water based medium, like acrylic, use a water based paint. Gesso will work well for this. It is inexpensive, opaque and will help level the texture of the existing painting. You may want to lightly sand the painting before painting over.
You'll notice when painting with acrylic paint that they dry to a flat finish. But mediums abound that can be added to the paints to increase luminosity or to get a matte or semi-matte finish. Acrylic pigments can also be diluted with water or a medium to create watercolor-like transparent washes.