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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.
Yes, you can use latex paint over oil-based paint. First, scuff down the surface of the oil paint layer for improved stickability. This has less to do with the initial coat being oil-based than the fact that this is a paint-over-paint project.