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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.
Oils and acrylics DO NOT mix! You can start a painting in acrylic, then paint on top with oils, but not the other way around. One of the reasons I like oils, other than the texture and richness of colors, is that there are not so many products to tempt me.or oils: I get along with just linseed oil. Turpenoid (odorless thinner) can be useful as well, if you want to really thin your brushes. There are myriad products for thinning and thickening paint, but just start with linseed oil and maybe turpenoid and then branch out from there if you want.